61506513 has 8 divisors (see below), whose sum is σ = 91120800. Its totient is φ = 41004324.

The previous prime is 61506509. The next prime is 61506521. The reversal of 61506513 is 31560516.

It is a happy number.

61506513 is a `hidden beast` number, since 6 + 1 + 5 + 0 + 651 + 3 = 666.

61506513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61506513 - 2² = 61506509 is a prime.

It is a super-2 number, since 2×61506513² = 7566102282838338, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2278019 = 61506513 / (6 + 1 + 5 + 0 + 6 + 5 + 1 + 3).

It is not an unprimeable number, because it can be changed into a prime (61505513) 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 7 ways as a sum of consecutive naturals, for example, 1138983 + ... + 1139036.

It is an arithmetic number, because the mean of its divisors is an integer number (11390100).

Almost surely, 2^61506513 is an apocalyptic number.

It is an amenable number.

61506513 is a deficient number, since it is larger than the sum of its proper divisors (29614287).

61506513 is a wasteful number, since it uses less digits than its factorization.

61506513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2278028 (or 2278022 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 61506513 is about 7842.6088133988. The cubic root of 61506513 is about 394.7362721760.

The spelling of 61506513 in words is "sixty-one million, five hundred six thousand, five hundred thirteen".