61365997 has 24 divisors (see below), whose sum is σ = 78599808. Its totient is φ = 46881120.

The previous prime is 61365979. The next prime is 61366007. The reversal of 61365997 is 79956316.

It is not a de Polignac number, because 61365997 - 2¹⁹ = 60841709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61365907) 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, 44208 + ... + 45574.

It is an arithmetic number, because the mean of its divisors is an integer number (3274992).

Almost surely, 2^61365997 is an apocalyptic number.

It is an amenable number.

61365997 is a deficient number, since it is larger than the sum of its proper divisors (17233811).

61365997 is a wasteful number, since it uses less digits than its factorization.

61365997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449 (or 1438 counting only the distinct ones).

The product of its digits is 306180, while the sum is 46.

The square root of 61365997 is about 7833.6451923737. The cubic root of 61365997 is about 394.4354419481.

The spelling of 61365997 in words is "sixty-one million, three hundred sixty-five thousand, nine hundred ninety-seven".