61172515 has 8 divisors (see below), whose sum is σ = 73511568. Its totient is φ = 48868320.

The previous prime is 61172509. The next prime is 61172549. The reversal of 61172515 is 51527116.

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

It is not a de Polignac number, because 61172515 - 2¹⁵ = 61139747 is a prime.

It is a Duffinian 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, 4681 + ... + 12010.

It is an arithmetic number, because the mean of its divisors is an integer number (9188946).

Almost surely, 2^61172515 is an apocalyptic number.

61172515 is a deficient number, since it is larger than the sum of its proper divisors (12339053).

61172515 is a wasteful number, since it uses less digits than its factorization.

61172515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17429.

The product of its digits is 2100, while the sum is 28.

The square root of 61172515 is about 7821.2860195750. The cubic root of 61172515 is about 394.0204645507.

The spelling of 61172515 in words is "sixty-one million, one hundred seventy-two thousand, five hundred fifteen".