31772121 has 4 divisors (see below), whose sum is σ = 42362832. Its totient is φ = 21181412.

The previous prime is 31772107. The next prime is 31772173. The reversal of 31772121 is 12127713.

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 31772121 - 2⁶ = 31772057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31772091 and 31772100.

It is not an unprimeable number, because it can be changed into a prime (31762121) 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, 5295351 + ... + 5295356.

It is an arithmetic number, because the mean of its divisors is an integer number (10590708).

Almost surely, 2^31772121 is an apocalyptic number.

It is an amenable number.

31772121 is a deficient number, since it is larger than the sum of its proper divisors (10590711).

31772121 is a wasteful number, since it uses less digits than its factorization.

31772121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10590710.

The product of its digits is 588, while the sum is 24.

The square root of 31772121 is about 5636.6764143421. The cubic root of 31772121 is about 316.7247990537.

Adding to 31772121 its reverse (12127713), we get a palindrome (43899834).

The spelling of 31772121 in words is "thirty-one million, seven hundred seventy-two thousand, one hundred twenty-one".