55378291 has 2 divisors, whose sum is σ = 55378292. Its totient is φ = 55378290.

The previous prime is 55378283. The next prime is 55378303. The reversal of 55378291 is 19287355.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55378291 - 2³ = 55378283 is a prime.

It is a super-2 number, since 2×55378291² = 6133510228161362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55378091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27689145 + 27689146.

It is an arithmetic number, because the mean of its divisors is an integer number (27689146).

Almost surely, 2^55378291 is an apocalyptic number.

55378291 is a deficient number, since it is larger than the sum of its proper divisors (1).

55378291 is an equidigital number, since it uses as much as digits as its factorization.

55378291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 40.

The square root of 55378291 is about 7441.6591563979. The cubic root of 55378291 is about 381.1651472543.

The spelling of 55378291 in words is "fifty-five million, three hundred seventy-eight thousand, two hundred ninety-one".