61253557 has 2 divisors, whose sum is σ = 61253558. Its totient is φ = 61253556.

The previous prime is 61253513. The next prime is 61253609. The reversal of 61253557 is 75535216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58461316 + 2792241 = 7646^2 + 1671^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61253557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61253957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30626778 + 30626779.

It is an arithmetic number, because the mean of its divisors is an integer number (30626779).

Almost surely, 2^61253557 is an apocalyptic number.

It is an amenable number.

61253557 is a deficient number, since it is larger than the sum of its proper divisors (1).

61253557 is an equidigital number, since it uses as much as digits as its factorization.

61253557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31500, while the sum is 34.

The square root of 61253557 is about 7826.4651663443. The cubic root of 61253557 is about 394.1943886051.

The spelling of 61253557 in words is "sixty-one million, two hundred fifty-three thousand, five hundred fifty-seven".