161651012 has 24 divisors (see below), whose sum is σ = 299628000. Its totient is φ = 76095936.

The previous prime is 161651003. The next prime is 161651029. The reversal of 161651012 is 210156161.

It is a super-2 number, since 2×161651012² = 52262099361248288, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5864 + ... + 18912.

It is an arithmetic number, because the mean of its divisors is an integer number (12484500).

Almost surely, 2^161651012 is an apocalyptic number.

It is an amenable number.

161651012 is a deficient number, since it is larger than the sum of its proper divisors (137976988).

161651012 is a wasteful number, since it uses less digits than its factorization.

161651012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13235 (or 13233 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 161651012 is about 12714.2051265504. The cubic root of 161651012 is about 544.7444437747.

The spelling of 161651012 in words is "one hundred sixty-one million, six hundred fifty-one thousand, twelve".