164121637 has 4 divisors (see below), whose sum is σ = 164178316. Its totient is φ = 164064960.

The previous prime is 164121613. The next prime is 164121641. The reversal of 164121637 is 736121461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 158986881 + 5134756 = 12609^2 + 2266^2 .

It is a cyclic number.

It is not a de Polignac number, because 164121637 - 2¹⁹ = 163597349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 164121599 and 164121608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164121437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23748 + ... + 29869.

It is an arithmetic number, because the mean of its divisors is an integer number (41044579).

Almost surely, 2^164121637 is an apocalyptic number.

It is an amenable number.

164121637 is a deficient number, since it is larger than the sum of its proper divisors (56679).

164121637 is an equidigital number, since it uses as much as digits as its factorization.

164121637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56678.

The product of its digits is 6048, while the sum is 31.

The square root of 164121637 is about 12810.9967215670. The cubic root of 164121637 is about 547.5056602349.

It can be divided in two parts, 164 and 121637, that added together give a square (121801 = 349²).

The spelling of 164121637 in words is "one hundred sixty-four million, one hundred twenty-one thousand, six hundred thirty-seven".