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164722997 = 612700377
BaseRepresentation
bin10011101000101…
…11100100110101
3102110221210110202
421310113210311
5314132113442
624202330245
74040056655
oct1164274465
9373853422
10164722997
1184a8890a
12471b9985
132818543a
1417c3c365
15e6dbc32
hex9d17935

164722997 has 4 divisors (see below), whose sum is σ = 167423436. Its totient is φ = 162022560.

The previous prime is 164722973. The next prime is 164723011. The reversal of 164722997 is 799227461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 799227461 = 3125781531.

It can be written as a sum of positive squares in 2 ways, for example, as 72063121 + 92659876 = 8489^2 + 9626^2 .

It is a cyclic number.

It is not a de Polignac number, because 164722997 - 214 = 164706613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164722907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1350128 + ... + 1350249.

It is an arithmetic number, because the mean of its divisors is an integer number (41855859).

Almost surely, 2164722997 is an apocalyptic number.

It is an amenable number.

164722997 is a deficient number, since it is larger than the sum of its proper divisors (2700439).

164722997 is an equidigital number, since it uses as much as digits as its factorization.

164722997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2700438.

The product of its digits is 381024, while the sum is 47.

The square root of 164722997 is about 12834.4457223520. The cubic root of 164722997 is about 548.1735524410.

The spelling of 164722997 in words is "one hundred sixty-four million, seven hundred twenty-two thousand, nine hundred ninety-seven".

Divisors: 1 61 2700377 164722997