57181961 has 2 divisors, whose sum is σ = 57181962. Its totient is φ = 57181960.

The previous prime is 57181913. The next prime is 57181967. The reversal of 57181961 is 16918175.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37210000 + 19971961 = 6100^2 + 4469^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57181961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (57181967) 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 as a sum of consecutive naturals, namely, 28590980 + 28590981.

It is an arithmetic number, because the mean of its divisors is an integer number (28590981).

Almost surely, 2^57181961 is an apocalyptic number.

It is an amenable number.

57181961 is a deficient number, since it is larger than the sum of its proper divisors (1).

57181961 is an equidigital number, since it uses as much as digits as its factorization.

57181961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 38.

The square root of 57181961 is about 7561.8754948756. The cubic root of 57181961 is about 385.2591969105.

The spelling of 57181961 in words is "fifty-seven million, one hundred eighty-one thousand, nine hundred sixty-one".