31045247 has 16 divisors (see below), whose sum is σ = 33825600. Its totient is φ = 28483840.

The previous prime is 31045219. The next prime is 31045249. The reversal of 31045247 is 74254013.

It is a de Polignac number, because none of the positive numbers 2^k-31045247 is a prime.

It is a super-2 number, since 2×31045247² = 1927614722582018, 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 (31045249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348779 + ... + 348867.

It is an arithmetic number, because the mean of its divisors is an integer number (2114100).

Almost surely, 2^31045247 is an apocalyptic number.

31045247 is a deficient number, since it is larger than the sum of its proper divisors (2780353).

31045247 is an frugal number, since it uses more digits than its factorization.

31045247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 31045247 is about 5571.8261817828. The cubic root of 31045247 is about 314.2908275536.

The spelling of 31045247 in words is "thirty-one million, forty-five thousand, two hundred forty-seven".