31021449 has 4 divisors (see below), whose sum is σ = 41361936. Its totient is φ = 20680964.

The previous prime is 31021427. The next prime is 31021493. The reversal of 31021449 is 94412013.

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 31021449 - 2¹² = 31017353 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31021649) 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, 5170239 + ... + 5170244.

It is an arithmetic number, because the mean of its divisors is an integer number (10340484).

Almost surely, 2^31021449 is an apocalyptic number.

It is an amenable number.

31021449 is a deficient number, since it is larger than the sum of its proper divisors (10340487).

31021449 is a wasteful number, since it uses less digits than its factorization.

31021449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10340486.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 31021449 is about 5569.6902068248. The cubic root of 31021449 is about 314.2104995828.

The spelling of 31021449 in words is "thirty-one million, twenty-one thousand, four hundred forty-nine".