61313557 has 2 divisors, whose sum is σ = 61313558. Its totient is φ = 61313556.

The previous prime is 61313537. The next prime is 61313579. The reversal of 61313557 is 75531316.

61313557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49196196 + 12117361 = 7014^2 + 3481^2 .

It is a cyclic number.

It is not a de Polignac number, because 61313557 - 2¹⁵ = 61280789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61313507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30656778 + 30656779.

It is an arithmetic number, because the mean of its divisors is an integer number (30656779).

Almost surely, 2^61313557 is an apocalyptic number.

It is an amenable number.

61313557 is a deficient number, since it is larger than the sum of its proper divisors (1).

61313557 is an equidigital number, since it uses as much as digits as its factorization.

61313557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9450, while the sum is 31.

The square root of 61313557 is about 7830.2973762176. The cubic root of 61313557 is about 394.3230556634.

The spelling of 61313557 in words is "sixty-one million, three hundred thirteen thousand, five hundred fifty-seven".