61651315 has 24 divisors (see below), whose sum is σ = 81913104. Its totient is φ = 44510400.

The previous prime is 61651313. The next prime is 61651391. The reversal of 61651315 is 51315616.

It is not a de Polignac number, because 61651315 - 2¹ = 61651313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61651313) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109224 + ... + 109786.

It is an arithmetic number, because the mean of its divisors is an integer number (3413046).

Almost surely, 2^61651315 is an apocalyptic number.

61651315 is a deficient number, since it is larger than the sum of its proper divisors (20261789).

61651315 is a wasteful number, since it uses less digits than its factorization.

61651315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771 (or 760 counting only the distinct ones).

The product of its digits is 2700, while the sum is 28.

The square root of 61651315 is about 7851.8351358138. The cubic root of 61651315 is about 395.0457993148.

The spelling of 61651315 in words is "sixty-one million, six hundred fifty-one thousand, three hundred fifteen".