31370121 has 12 divisors (see below), whose sum is σ = 47697520. Its totient is φ = 19812600.

The previous prime is 31370113. The next prime is 31370173. The reversal of 31370121 is 12107313.

It is not a de Polignac number, because 31370121 - 2³ = 31370113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31370094 and 31370103.

It is not an unprimeable number, because it can be changed into a prime (31370221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91555 + ... + 91896.

Almost surely, 2^31370121 is an apocalyptic number.

It is an amenable number.

31370121 is a deficient number, since it is larger than the sum of its proper divisors (16327399).

31370121 is a wasteful number, since it uses less digits than its factorization.

31370121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183476 (or 183473 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 31370121 is about 5600.9035878151. The cubic root of 31370121 is about 315.3833277407.

Adding to 31370121 its reverse (12107313), we get a palindrome (43477434).

The spelling of 31370121 in words is "thirty-one million, three hundred seventy thousand, one hundred twenty-one".