61615989 has 24 divisors (see below), whose sum is σ = 93656472. Its totient is φ = 38983680.

The previous prime is 61615987. The next prime is 61615999. The reversal of 61615989 is 98951616.

It can be written as a sum of positive squares in 4 ways, for example, as 119025 + 61496964 = 345^2 + 7842^2 .

It is not a de Polignac number, because 61615989 - 2¹ = 61615987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61615987) 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, 11397 + ... + 15909.

It is an arithmetic number, because the mean of its divisors is an integer number (3902353).

Almost surely, 2^61615989 is an apocalyptic number.

It is an amenable number.

61615989 is a deficient number, since it is larger than the sum of its proper divisors (32040483).

61615989 is a wasteful number, since it uses less digits than its factorization.

61615989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4597 (or 4594 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 61615989 is about 7849.5852756690. The cubic root of 61615989 is about 394.9703315857.

The spelling of 61615989 in words is "sixty-one million, six hundred fifteen thousand, nine hundred eighty-nine".