55870261 has 2 divisors, whose sum is σ = 55870262. Its totient is φ = 55870260.

The previous prime is 55870253. The next prime is 55870267. The reversal of 55870261 is 16207855.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54671236 + 1199025 = 7394^2 + 1095^2 .

It is a cyclic number.

It is not a de Polignac number, because 55870261 - 2³ = 55870253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55870267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27935130 + 27935131.

It is an arithmetic number, because the mean of its divisors is an integer number (27935131).

Almost surely, 2^55870261 is an apocalyptic number.

It is an amenable number.

55870261 is a deficient number, since it is larger than the sum of its proper divisors (1).

55870261 is an equidigital number, since it uses as much as digits as its factorization.

55870261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 55870261 is about 7474.6411954020. The cubic root of 55870261 is about 382.2905535954.

The spelling of 55870261 in words is "fifty-five million, eight hundred seventy thousand, two hundred sixty-one".