61131215 has 8 divisors (see below), whose sum is σ = 75340320. Its totient is φ = 47583072.

The previous prime is 61131199. The next prime is 61131223. The reversal of 61131215 is 51213116.

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 61131215 - 2⁴ = 61131199 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165035 + ... + 165404.

It is an arithmetic number, because the mean of its divisors is an integer number (9417540).

Almost surely, 2^61131215 is an apocalyptic number.

61131215 is a deficient number, since it is larger than the sum of its proper divisors (14209105).

61131215 is a wasteful number, since it uses less digits than its factorization.

61131215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330481.

The product of its digits is 180, while the sum is 20.

The square root of 61131215 is about 7818.6453430246. The cubic root of 61131215 is about 393.9317716208.

The spelling of 61131215 in words is "sixty-one million, one hundred thirty-one thousand, two hundred fifteen".