31457661 has 4 divisors (see below), whose sum is σ = 41943552. Its totient is φ = 20971772.

The previous prime is 31457641. The next prime is 31457681. The reversal of 31457661 is 16675413.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (31457641) and next prime (31457681).

It is a cyclic number.

It is not a de Polignac number, because 31457661 - 2⁹ = 31457149 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31457611) 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, 5242941 + ... + 5242946.

It is an arithmetic number, because the mean of its divisors is an integer number (10485888).

Almost surely, 2^31457661 is an apocalyptic number.

It is an amenable number.

31457661 is a deficient number, since it is larger than the sum of its proper divisors (10485891).

31457661 is a wasteful number, since it uses less digits than its factorization.

31457661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10485890.

The product of its digits is 15120, while the sum is 33.

The square root of 31457661 is about 5608.7129539672. The cubic root of 31457661 is about 315.6764199596.

It can be divided in two parts, 314 and 57661, that added together give a palindrome (57975).

The spelling of 31457661 in words is "thirty-one million, four hundred fifty-seven thousand, six hundred sixty-one".