373156981 has 2 divisors, whose sum is σ = 373156982. Its totient is φ = 373156980.

The previous prime is 373156943. The next prime is 373156997. The reversal of 373156981 is 189651373.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 338228881 + 34928100 = 18391^2 + 5910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-373156981 is a prime.

It is a super-2 number, since 2×373156981² = 278492264938068722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (373156921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 186578490 + 186578491.

It is an arithmetic number, because the mean of its divisors is an integer number (186578491).

Almost surely, 2^373156981 is an apocalyptic number.

It is an amenable number.

373156981 is a deficient number, since it is larger than the sum of its proper divisors (1).

373156981 is an equidigital number, since it uses as much as digits as its factorization.

373156981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The square root of 373156981 is about 19317.2715723520. The cubic root of 373156981 is about 719.9414696505.

The spelling of 373156981 in words is "three hundred seventy-three million, one hundred fifty-six thousand, nine hundred eighty-one".