31465921 has 4 divisors (see below), whose sum is σ = 31577392. Its totient is φ = 31354452.

The previous prime is 31465891. The next prime is 31465979. The reversal of 31465921 is 12956413.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12956413 = 127 ⋅102019.

It is a cyclic number.

It is not a de Polignac number, because 31465921 - 2¹³ = 31457729 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (31465321) 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, 55311 + ... + 55876.

It is an arithmetic number, because the mean of its divisors is an integer number (7894348).

Almost surely, 2^31465921 is an apocalyptic number.

It is an amenable number.

31465921 is a deficient number, since it is larger than the sum of its proper divisors (111471).

31465921 is a wasteful number, since it uses less digits than its factorization.

31465921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111470.

The product of its digits is 6480, while the sum is 31.

The square root of 31465921 is about 5609.4492599541. The cubic root of 31465921 is about 315.7040471359.

The spelling of 31465921 in words is "thirty-one million, four hundred sixty-five thousand, nine hundred twenty-one".