61502431 has 4 divisors (see below), whose sum is σ = 61846200. Its totient is φ = 61158664.

The previous prime is 61502429. The next prime is 61502453. The reversal of 61502431 is 13420516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61502431 - 2¹ = 61502429 is a prime.

It is a super-2 number, since 2×61502431² = 7565098037819522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61502531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171616 + ... + 171973.

It is an arithmetic number, because the mean of its divisors is an integer number (15461550).

Almost surely, 2^61502431 is an apocalyptic number.

61502431 is a deficient number, since it is larger than the sum of its proper divisors (343769).

61502431 is a wasteful number, since it uses less digits than its factorization.

61502431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343768.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 61502431 is about 7842.3485640464. The cubic root of 61502431 is about 394.7275395013.

Adding to 61502431 its reverse (13420516), we get a palindrome (74922947).

The spelling of 61502431 in words is "sixty-one million, five hundred two thousand, four hundred thirty-one".