55974781 has 2 divisors, whose sum is σ = 55974782. Its totient is φ = 55974780.

The previous prime is 55974773. The next prime is 55974797. The reversal of 55974781 is 18747955.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55279225 + 695556 = 7435^2 + 834^2 .

It is a cyclic number.

It is not a de Polignac number, because 55974781 - 2³ = 55974773 is a prime.

It is a super-2 number, since 2×55974781² = 6266352215995922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55974701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27987390 + 27987391.

It is an arithmetic number, because the mean of its divisors is an integer number (27987391).

Almost surely, 2^55974781 is an apocalyptic number.

It is an amenable number.

55974781 is a deficient number, since it is larger than the sum of its proper divisors (1).

55974781 is an equidigital number, since it uses as much as digits as its factorization.

55974781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352800, while the sum is 46.

The square root of 55974781 is about 7481.6295684831. The cubic root of 55974781 is about 382.5287967270.

The spelling of 55974781 in words is "fifty-five million, nine hundred seventy-four thousand, seven hundred eighty-one".