55401439 has 2 divisors, whose sum is σ = 55401440. Its totient is φ = 55401438.

The previous prime is 55401431. The next prime is 55401443. The reversal of 55401439 is 93410455.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55401439 - 2³ = 55401431 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 55401439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55401431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27700719 + 27700720.

It is an arithmetic number, because the mean of its divisors is an integer number (27700720).

Almost surely, 2^55401439 is an apocalyptic number.

55401439 is a deficient number, since it is larger than the sum of its proper divisors (1).

55401439 is an equidigital number, since it uses as much as digits as its factorization.

55401439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 55401439 is about 7443.2142922262. The cubic root of 55401439 is about 381.2182485785.

The spelling of 55401439 in words is "fifty-five million, four hundred one thousand, four hundred thirty-nine".