56611381 has 2 divisors, whose sum is σ = 56611382. Its totient is φ = 56611380.

The previous prime is 56611361. The next prime is 56611397. The reversal of 56611381 is 18311665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54022500 + 2588881 = 7350^2 + 1609^2 .

It is a cyclic number.

It is not a de Polignac number, because 56611381 - 2⁷ = 56611253 is a prime.

It is a super-2 number, since 2×56611381² = 6409696917454322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56611361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28305690 + 28305691.

It is an arithmetic number, because the mean of its divisors is an integer number (28305691).

Almost surely, 2^56611381 is an apocalyptic number.

It is an amenable number.

56611381 is a deficient number, since it is larger than the sum of its proper divisors (1).

56611381 is an equidigital number, since it uses as much as digits as its factorization.

56611381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 31.

The square root of 56611381 is about 7524.0534952910. The cubic root of 56611381 is about 383.9734976103.

The spelling of 56611381 in words is "fifty-six million, six hundred eleven thousand, three hundred eighty-one".