161251002 has 24 divisors (see below), whose sum is σ = 381139200. Its totient is φ = 48863880.

The previous prime is 161250979. The next prime is 161251009. The reversal of 161251002 is 200152161.

161251002 is a `hidden beast` number, since 1 + 612 + 51 + 0 + 0 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (161251009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 407002 + ... + 407397.

It is an arithmetic number, because the mean of its divisors is an integer number (15880800).

Almost surely, 2^161251002 is an apocalyptic number.

161251002 is an abundant number, since it is smaller than the sum of its proper divisors (219888198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161251002 is a wasteful number, since it uses less digits than its factorization.

161251002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814418 (or 814415 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 161251002 is about 12698.4645528505. The cubic root of 161251002 is about 544.2947441292.

The spelling of 161251002 in words is "one hundred sixty-one million, two hundred fifty-one thousand, two".