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166000991 = 1312769307
BaseRepresentation
bin10011110010011…
…11100101011111
3102120100201112212
421321033211133
5314444012431
624245551035
74053661622
oct1171174537
9376321485
10166000991
1185781002
124771547b
1328512050
1418091db9
15e89072b
hex9e4f95f

166000991 has 4 divisors (see below), whose sum is σ = 178770312. Its totient is φ = 153231672.

The previous prime is 166000987. The next prime is 166001021. The reversal of 166000991 is 199000661.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 166000991 - 22 = 166000987 is a prime.

166000991 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166000921) 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, 6384641 + ... + 6384666.

It is an arithmetic number, because the mean of its divisors is an integer number (44692578).

Almost surely, 2166000991 is an apocalyptic number.

166000991 is a deficient number, since it is larger than the sum of its proper divisors (12769321).

166000991 is a wasteful number, since it uses less digits than its factorization.

166000991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12769320.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 166000991 is about 12884.1371849263. The cubic root of 166000991 is about 549.5875596623.

The spelling of 166000991 in words is "one hundred sixty-six million, nine hundred ninety-one", and thus it is an aban number.

Divisors: 1 13 12769307 166000991