55402397 has 2 divisors, whose sum is σ = 55402398. Its totient is φ = 55402396.

The previous prime is 55402381. The next prime is 55402409. The reversal of 55402397 is 79320455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52693081 + 2709316 = 7259^2 + 1646^2 .

It is a cyclic number.

It is not a de Polignac number, because 55402397 - 2⁴ = 55402381 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55402097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27701198 + 27701199.

It is an arithmetic number, because the mean of its divisors is an integer number (27701199).

Almost surely, 2^55402397 is an apocalyptic number.

It is an amenable number.

55402397 is a deficient number, since it is larger than the sum of its proper divisors (1).

55402397 is an equidigital number, since it uses as much as digits as its factorization.

55402397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 55402397 is about 7443.2786458657. The cubic root of 55402397 is about 381.2204459040.

The spelling of 55402397 in words is "fifty-five million, four hundred two thousand, three hundred ninety-seven".