31144997 has 4 divisors (see below), whose sum is σ = 33540780. Its totient is φ = 28749216.

The previous prime is 31144963. The next prime is 31145011. The reversal of 31144997 is 79944113.

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 7806436 + 23338561 = 2794^2 + 4831^2 .

It is a cyclic number.

It is not a de Polignac number, because 31144997 - 2⁸ = 31144741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31144997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31144907) 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, 1197872 + ... + 1197897.

It is an arithmetic number, because the mean of its divisors is an integer number (8385195).

Almost surely, 2^31144997 is an apocalyptic number.

It is an amenable number.

31144997 is a deficient number, since it is larger than the sum of its proper divisors (2395783).

31144997 is a wasteful number, since it uses less digits than its factorization.

31144997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2395782.

The product of its digits is 27216, while the sum is 38.

The square root of 31144997 is about 5580.7702873349. The cubic root of 31144997 is about 314.6270786273.

The spelling of 31144997 in words is "thirty-one million, one hundred forty-four thousand, nine hundred ninety-seven".