31121941 has 4 divisors (see below), whose sum is σ = 31148812. Its totient is φ = 31095072.

The previous prime is 31121939. The next prime is 31121957. The reversal of 31121941 is 14912113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14912113 = 47 ⋅317279.

It can be written as a sum of positive squares in 2 ways, for example, as 4558225 + 26563716 = 2135^2 + 5154^2 .

It is a cyclic number.

It is not a de Polignac number, because 31121941 - 2¹ = 31121939 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11616 + ... + 14041.

It is an arithmetic number, because the mean of its divisors is an integer number (7787203).

Almost surely, 2^31121941 is an apocalyptic number.

It is an amenable number.

31121941 is a deficient number, since it is larger than the sum of its proper divisors (26871).

31121941 is a wasteful number, since it uses less digits than its factorization.

31121941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26870.

The product of its digits is 216, while the sum is 22.

The square root of 31121941 is about 5578.7042402336. The cubic root of 31121941 is about 314.5494221456.

The spelling of 31121941 in words is "thirty-one million, one hundred twenty-one thousand, nine hundred forty-one".