55013257 has 4 divisors (see below), whose sum is σ = 59245060. Its totient is φ = 50781456.

The previous prime is 55013243. The next prime is 55013279. The reversal of 55013257 is 75231055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75231055 = 5 ⋅15046211.

It can be written as a sum of positive squares in 2 ways, for example, as 29419776 + 25593481 = 5424^2 + 5059^2 .

It is a cyclic number.

It is not a de Polignac number, because 55013257 - 2²³ = 46624649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55013557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2115882 + ... + 2115907.

It is an arithmetic number, because the mean of its divisors is an integer number (14811265).

Almost surely, 2^55013257 is an apocalyptic number.

It is an amenable number.

55013257 is a deficient number, since it is larger than the sum of its proper divisors (4231803).

55013257 is a wasteful number, since it uses less digits than its factorization.

55013257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4231802.

The product of its (nonzero) digits is 5250, while the sum is 28.

The square root of 55013257 is about 7417.0922200010. The cubic root of 55013257 is about 380.3257986159.

The spelling of 55013257 in words is "fifty-five million, thirteen thousand, two hundred fifty-seven".