260426557 has 2 divisors, whose sum is σ = 260426558. Its totient is φ = 260426556.

The previous prime is 260426489. The next prime is 260426561. The reversal of 260426557 is 755624062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 251729956 + 8696601 = 15866^2 + 2949^2 .

It is a cyclic number.

It is not a de Polignac number, because 260426557 - 2⁷ = 260426429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (260426057) 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, 130213278 + 130213279.

It is an arithmetic number, because the mean of its divisors is an integer number (130213279).

Almost surely, 2^260426557 is an apocalyptic number.

It is an amenable number.

260426557 is a deficient number, since it is larger than the sum of its proper divisors (1).

260426557 is an equidigital number, since it uses as much as digits as its factorization.

260426557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 37.

The square root of 260426557 is about 16137.7370470584. The cubic root of 260426557 is about 638.5992778851.

It can be divided in two parts, 2604 and 26557, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 260426557 in words is "two hundred sixty million, four hundred twenty-six thousand, five hundred fifty-seven".