32156381 has 2 divisors, whose sum is σ = 32156382. Its totient is φ = 32156380.

The previous prime is 32156321. The next prime is 32156437. The reversal of 32156381 is 18365123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24344356 + 7812025 = 4934^2 + 2795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-32156381 is a prime.

It is a super-2 number, since 2×32156381² = 2068065678034322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (32156321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16078190 + 16078191.

It is an arithmetic number, because the mean of its divisors is an integer number (16078191).

Almost surely, 2^32156381 is an apocalyptic number.

It is an amenable number.

32156381 is a deficient number, since it is larger than the sum of its proper divisors (1).

32156381 is an equidigital number, since it uses as much as digits as its factorization.

32156381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 32156381 is about 5670.6596618030. The cubic root of 32156381 is about 317.9965355687.

The spelling of 32156381 in words is "thirty-two million, one hundred fifty-six thousand, three hundred eighty-one".