61398915 has 16 divisors (see below), whose sum is σ = 98340000. Its totient is φ = 32712192.

The previous prime is 61398907. The next prime is 61398919. The reversal of 61398915 is 51989316.

It is not a de Polignac number, because 61398915 - 2³ = 61398907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61398919) 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, 20961 + ... + 23709.

It is an arithmetic number, because the mean of its divisors is an integer number (6146250).

Almost surely, 2^61398915 is an apocalyptic number.

61398915 is a deficient number, since it is larger than the sum of its proper divisors (36941085).

61398915 is a wasteful number, since it uses less digits than its factorization.

61398915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4246.

The product of its digits is 58320, while the sum is 42.

The square root of 61398915 is about 7835.7459759745. The cubic root of 61398915 is about 394.5059571388.

The spelling of 61398915 in words is "sixty-one million, three hundred ninety-eight thousand, nine hundred fifteen".