61813513 has 8 divisors (see below), whose sum is σ = 65594880. Its totient is φ = 58048320.

The previous prime is 61813501. The next prime is 61813561. The reversal of 61813513 is 31531816.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61813513 - 2⁵ = 61813481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61813013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4348 + ... + 11938.

It is an arithmetic number, because the mean of its divisors is an integer number (8199360).

Almost surely, 2^61813513 is an apocalyptic number.

It is an amenable number.

61813513 is a deficient number, since it is larger than the sum of its proper divisors (3781367).

61813513 is a wasteful number, since it uses less digits than its factorization.

61813513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8087.

The product of its digits is 2160, while the sum is 28.

The square root of 61813513 is about 7862.1570195462. The cubic root of 61813513 is about 395.3919369898.

It can be divided in two parts, 61813 and 513, that added together give a palindrome (62326).

The spelling of 61813513 in words is "sixty-one million, eight hundred thirteen thousand, five hundred thirteen".