161251672 has 16 divisors (see below), whose sum is σ = 303442560. Its totient is φ = 80333664.

The previous prime is 161251667. The next prime is 161251679. The reversal of 161251672 is 276152161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161251679) 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, 34168 + ... + 38599.

It is an arithmetic number, because the mean of its divisors is an integer number (18965160).

Almost surely, 2^161251672 is an apocalyptic number.

It is an amenable number.

161251672 is a deficient number, since it is larger than the sum of its proper divisors (142190888).

161251672 is a wasteful number, since it uses less digits than its factorization.

161251672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73050 (or 73046 counting only the distinct ones).

The product of its digits is 5040, while the sum is 31.

The square root of 161251672 is about 12698.4909339653. The cubic root of 161251672 is about 544.2954979787.

The spelling of 161251672 in words is "one hundred sixty-one million, two hundred fifty-one thousand, six hundred seventy-two".