31603481 has 12 divisors (see below), whose sum is σ = 39591972. Its totient is φ = 25004448.

The previous prime is 31603427. The next prime is 31603487. The reversal of 31603481 is 18430613.

It can be written as a sum of positive squares in 2 ways, for example, as 1254400 + 30349081 = 1120^2 + 5509^2 .

It is not a de Polignac number, because 31603481 - 2¹⁰ = 31602457 is a prime.

It is a super-2 number, since 2×31603481² = 1997560022634722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31603481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31603487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24170 + ... + 25443.

It is an arithmetic number, because the mean of its divisors is an integer number (3299331).

Almost surely, 2^31603481 is an apocalyptic number.

It is an amenable number.

31603481 is a deficient number, since it is larger than the sum of its proper divisors (7988491).

31603481 is a wasteful number, since it uses less digits than its factorization.

31603481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49640 (or 49633 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 31603481 is about 5621.6973415509. The cubic root of 31603481 is about 316.1634342581.

The spelling of 31603481 in words is "thirty-one million, six hundred three thousand, four hundred eighty-one".