55633381 has 2 divisors, whose sum is σ = 55633382. Its totient is φ = 55633380.

The previous prime is 55633337. The next prime is 55633393. The reversal of 55633381 is 18333655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38068900 + 17564481 = 6170^2 + 4191^2 .

It is a cyclic number.

It is not a de Polignac number, because 55633381 - 2⁹ = 55632869 is a prime.

It is a super-2 number, since 2×55633381² = 6190146162982322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55633321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27816690 + 27816691.

It is an arithmetic number, because the mean of its divisors is an integer number (27816691).

Almost surely, 2^55633381 is an apocalyptic number.

It is an amenable number.

55633381 is a deficient number, since it is larger than the sum of its proper divisors (1).

55633381 is an equidigital number, since it uses as much as digits as its factorization.

55633381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 34.

The square root of 55633381 is about 7458.7787874424. The cubic root of 55633381 is about 381.7495068389.

The spelling of 55633381 in words is "fifty-five million, six hundred thirty-three thousand, three hundred eighty-one".