161029251 has 12 divisors (see below), whose sum is σ = 232741080. Its totient is φ = 107286720.

The previous prime is 161029201. The next prime is 161029259. The reversal of 161029251 is 152920161.

161029251 is a `hidden beast` number, since 1 + 610 + 29 + 25 + 1 = 666.

It is not a de Polignac number, because 161029251 - 2¹⁵ = 160996483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161029259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13291 + ... + 22331.

It is an arithmetic number, because the mean of its divisors is an integer number (19395090).

Almost surely, 2^161029251 is an apocalyptic number.

161029251 is a deficient number, since it is larger than the sum of its proper divisors (71711829).

161029251 is a wasteful number, since it uses less digits than its factorization.

161029251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11026 (or 11023 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 161029251 is about 12689.7301389746. The cubic root of 161029251 is about 544.0451265099.

The spelling of 161029251 in words is "one hundred sixty-one million, twenty-nine thousand, two hundred fifty-one".