31240253 has 4 divisors (see below), whose sum is σ = 34080288. Its totient is φ = 28400220.

The previous prime is 31240249. The next prime is 31240273. The reversal of 31240253 is 35204213.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 35204213 = 11 ⋅3200383.

It is a cyclic number.

It is not a de Polignac number, because 31240253 - 2² = 31240249 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31240243) 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, 1420001 + ... + 1420022.

It is an arithmetic number, because the mean of its divisors is an integer number (8520072).

Almost surely, 2^31240253 is an apocalyptic number.

It is an amenable number.

31240253 is a deficient number, since it is larger than the sum of its proper divisors (2840035).

31240253 is a wasteful number, since it uses less digits than its factorization.

31240253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2840034.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 31240253 is about 5589.2980775765. The cubic root of 31240253 is about 314.9475112005.

Adding to 31240253 its reverse (35204213), we get a palindrome (66444466).

The spelling of 31240253 in words is "thirty-one million, two hundred forty thousand, two hundred fifty-three".