31954121 has 4 divisors (see below), whose sum is σ = 31995012. Its totient is φ = 31913232.

The previous prime is 31954103. The next prime is 31954123. The reversal of 31954121 is 12145913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12145913 = 13 ⋅934301.

It can be written as a sum of positive squares in 2 ways, for example, as 7590025 + 24364096 = 2755^2 + 4936^2 .

It is a cyclic number.

It is not a de Polignac number, because 31954121 - 2¹⁸ = 31691977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31954123) 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, 19250 + ... + 20843.

It is an arithmetic number, because the mean of its divisors is an integer number (7998753).

Almost surely, 2^31954121 is an apocalyptic number.

It is an amenable number.

31954121 is a deficient number, since it is larger than the sum of its proper divisors (40891).

31954121 is an equidigital number, since it uses as much as digits as its factorization.

31954121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40890.

The product of its digits is 1080, while the sum is 26.

The square root of 31954121 is about 5652.7976259548. The cubic root of 31954121 is about 317.3284120483.

The spelling of 31954121 in words is "thirty-one million, nine hundred fifty-four thousand, one hundred twenty-one".