61313555 has 4 divisors (see below), whose sum is σ = 73576272. Its totient is φ = 49050840.

The previous prime is 61313537. The next prime is 61313557. The reversal of 61313555 is 55531316.

61313555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61313555 - 2¹⁸ = 61051411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61313557) 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 in 3 ways as a sum of consecutive naturals, for example, 6131351 + ... + 6131360.

It is an arithmetic number, because the mean of its divisors is an integer number (18394068).

Almost surely, 2^61313555 is an apocalyptic number.

61313555 is a deficient number, since it is larger than the sum of its proper divisors (12262717).

61313555 is a wasteful number, since it uses less digits than its factorization.

61313555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12262716.

The product of its digits is 6750, while the sum is 29.

The square root of 61313555 is about 7830.2972485085. The cubic root of 61313555 is about 394.3230513759.

The spelling of 61313555 in words is "sixty-one million, three hundred thirteen thousand, five hundred fifty-five".