61242931 has 4 divisors (see below), whose sum is σ = 62398512. Its totient is φ = 60087352.

The previous prime is 61242917. The next prime is 61242943. The reversal of 61242931 is 13924216.

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 61242931 - 2⁵ = 61242899 is a prime.

It is a super-2 number, since 2×61242931² = 7501393194941522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61242931.

It is not an unprimeable number, because it can be changed into a prime (61240931) 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, 577711 + ... + 577816.

It is an arithmetic number, because the mean of its divisors is an integer number (15599628).

Almost surely, 2^61242931 is an apocalyptic number.

61242931 is a deficient number, since it is larger than the sum of its proper divisors (1155581).

61242931 is a wasteful number, since it uses less digits than its factorization.

61242931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155580.

The product of its digits is 2592, while the sum is 28.

The square root of 61242931 is about 7825.7862863740. The cubic root of 61242931 is about 394.1715929123.

The spelling of 61242931 in words is "sixty-one million, two hundred forty-two thousand, nine hundred thirty-one".