61731957 has 16 divisors (see below), whose sum is σ = 94275072. Its totient is φ = 35197680.

The previous prime is 61731953. The next prime is 61731959. The reversal of 61731957 is 75913716.

It is not a de Polignac number, because 61731957 - 2² = 61731953 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61731953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7318 + ... + 13304.

It is an arithmetic number, because the mean of its divisors is an integer number (5892192).

Almost surely, 2^61731957 is an apocalyptic number.

It is an amenable number.

61731957 is a deficient number, since it is larger than the sum of its proper divisors (32543115).

61731957 is a wasteful number, since it uses less digits than its factorization.

61731957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6488.

The product of its digits is 39690, while the sum is 39.

The square root of 61731957 is about 7856.9686902774. The cubic root of 61731957 is about 395.2179686800.

The spelling of 61731957 in words is "sixty-one million, seven hundred thirty-one thousand, nine hundred fifty-seven".