55940581 has 2 divisors, whose sum is σ = 55940582. Its totient is φ = 55940580.

The previous prime is 55940561. The next prime is 55940587. The reversal of 55940581 is 18504955.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38551681 + 17388900 = 6209^2 + 4170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55940581 is a prime.

It is a super-2 number, since 2×55940581² = 6258697205235122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55940581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55940587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27970290 + 27970291.

It is an arithmetic number, because the mean of its divisors is an integer number (27970291).

Almost surely, 2^55940581 is an apocalyptic number.

It is an amenable number.

55940581 is a deficient number, since it is larger than the sum of its proper divisors (1).

55940581 is an equidigital number, since it uses as much as digits as its factorization.

55940581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36000, while the sum is 37.

The square root of 55940581 is about 7479.3436209336. The cubic root of 55940581 is about 382.4508738366.

The spelling of 55940581 in words is "fifty-five million, nine hundred forty thousand, five hundred eighty-one".