31650661 has 4 divisors (see below), whose sum is σ = 36172192. Its totient is φ = 27129132.

The previous prime is 31650653. The next prime is 31650667. The reversal of 31650661 is 16605613.

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 a cyclic number.

It is not a de Polignac number, because 31650661 - 2³ = 31650653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31650667) 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, 2260755 + ... + 2260768.

It is an arithmetic number, because the mean of its divisors is an integer number (9043048).

Almost surely, 2^31650661 is an apocalyptic number.

It is an amenable number.

31650661 is a deficient number, since it is larger than the sum of its proper divisors (4521531).

31650661 is an equidigital number, since it uses as much as digits as its factorization.

31650661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4521530.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 31650661 is about 5625.8920181603. The cubic root of 31650661 is about 316.3206867046.

The spelling of 31650661 in words is "thirty-one million, six hundred fifty thousand, six hundred sixty-one".