61125515 has 16 divisors (see below), whose sum is σ = 80252640. Its totient is φ = 44325120.

The previous prime is 61125511. The next prime is 61125563. The reversal of 61125515 is 51552116.

It is not a de Polignac number, because 61125515 - 2² = 61125511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61125511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19967 + ... + 22823.

It is an arithmetic number, because the mean of its divisors is an integer number (5015790).

Almost surely, 2^61125515 is an apocalyptic number.

61125515 is a deficient number, since it is larger than the sum of its proper divisors (19127125).

61125515 is a wasteful number, since it uses less digits than its factorization.

61125515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3262.

The product of its digits is 1500, while the sum is 26.

The square root of 61125515 is about 7818.2808212548. The cubic root of 61125515 is about 393.9195275712.

The spelling of 61125515 in words is "sixty-one million, one hundred twenty-five thousand, five hundred fifteen".