55540487 has 2 divisors, whose sum is σ = 55540488. Its totient is φ = 55540486.

The previous prime is 55540453. The next prime is 55540519. The reversal of 55540487 is 78404555.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55540487 - 2⁸ = 55540231 is a prime.

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 55540487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55540427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27770243 + 27770244.

It is an arithmetic number, because the mean of its divisors is an integer number (27770244).

Almost surely, 2^55540487 is an apocalyptic number.

55540487 is a deficient number, since it is larger than the sum of its proper divisors (1).

55540487 is an equidigital number, since it uses as much as digits as its factorization.

55540487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112000, while the sum is 38.

The square root of 55540487 is about 7452.5490270108. The cubic root of 55540487 is about 381.5369126846.

The spelling of 55540487 in words is "fifty-five million, five hundred forty thousand, four hundred eighty-seven".