31553140 has 12 divisors (see below), whose sum is σ = 66261636. Its totient is φ = 12621248.

The previous prime is 31553089. The next prime is 31553161. The reversal of 31553140 is 4135513.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25020004 + 6533136 = 5002^2 + 2556^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 788809 + ... + 788848.

It is an arithmetic number, because the mean of its divisors is an integer number (5521803).

Almost surely, 2^31553140 is an apocalyptic number.

It is an amenable number.

31553140 is an abundant number, since it is smaller than the sum of its proper divisors (34708496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31553140 is a wasteful number, since it uses less digits than its factorization.

31553140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1577666 (or 1577664 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 31553140 is about 5617.2181727257. The cubic root of 31553140 is about 315.9954734170.

Adding to 31553140 its reverse (4135513), we get a palindrome (35688653).

The spelling of 31553140 in words is "thirty-one million, five hundred fifty-three thousand, one hundred forty".