61931 has 4 divisors (see below), whose sum is σ = 65592. Its totient is φ = 58272.

The previous prime is 61927. The next prime is 61933. The reversal of 61931 is 13916.

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 61931 - 2² = 61927 is a prime.

It is a super-2 number, since 2×61931² = 7670897522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (61933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1805 + ... + 1838.

It is an arithmetic number, because the mean of its divisors is an integer number (16398).

2⁶¹⁹³¹ is an apocalyptic number.

61931 is a deficient number, since it is larger than the sum of its proper divisors (3661).

61931 is a wasteful number, since it uses less digits than its factorization.

61931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3660.

The product of its digits is 162, while the sum is 20.

The square root of 61931 is about 248.8593980544. The cubic root of 61931 is about 39.5642281456.

The spelling of 61931 in words is "sixty-one thousand, nine hundred thirty-one".