31061725 has 12 divisors (see below), whose sum is σ = 38608020. Its totient is φ = 24790400.

The previous prime is 31061717. The next prime is 31061729. The reversal of 31061725 is 52716013.

It can be written as a sum of positive squares in 6 ways, for example, as 1315609 + 29746116 = 1147^2 + 5454^2 .

It is not a de Polignac number, because 31061725 - 2³ = 31061717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 31061725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31061729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11505 + ... + 13945.

It is an arithmetic number, because the mean of its divisors is an integer number (3217335).

Almost surely, 2^31061725 is an apocalyptic number.

It is an amenable number.

31061725 is a deficient number, since it is larger than the sum of its proper divisors (7546295).

31061725 is a wasteful number, since it uses less digits than its factorization.

31061725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2960 (or 2955 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 31061725 is about 5573.3046749662. The cubic root of 31061725 is about 314.3464234848.

Adding to 31061725 its reverse (52716013), we get a palindrome (83777738).

The spelling of 31061725 in words is "thirty-one million, sixty-one thousand, seven hundred twenty-five".