31249469 has 4 divisors (see below), whose sum is σ = 31422300. Its totient is φ = 31076640.

The previous prime is 31249459. The next prime is 31249483. The reversal of 31249469 is 96494213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 302500 + 30946969 = 550^2 + 5563^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31249469 is a prime.

It is a super-2 number, since 2×31249469² = 1953058625563922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31249429) 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, 86144 + ... + 86505.

It is an arithmetic number, because the mean of its divisors is an integer number (7855575).

Almost surely, 2^31249469 is an apocalyptic number.

It is an amenable number.

31249469 is a deficient number, since it is larger than the sum of its proper divisors (172831).

31249469 is a wasteful number, since it uses less digits than its factorization.

31249469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172830.

The product of its digits is 46656, while the sum is 38.

The square root of 31249469 is about 5590.1224494639. The cubic root of 31249469 is about 314.9784784154.

The spelling of 31249469 in words is "thirty-one million, two hundred forty-nine thousand, four hundred sixty-nine".