31445613 has 6 divisors (see below), whose sum is σ = 45421454. Its totient is φ = 20963736.

The previous prime is 31445611. The next prime is 31445621. The reversal of 31445613 is 31654413.

31445613 is a `hidden beast` number, since 3 + 1 + 4 + 45 + 613 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18507204 + 12938409 = 4302^2 + 3597^2 .

It is not a de Polignac number, because 31445613 - 2¹ = 31445611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31445611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1746970 + ... + 1746987.

Almost surely, 2^31445613 is an apocalyptic number.

It is an amenable number.

31445613 is a deficient number, since it is larger than the sum of its proper divisors (13975841).

31445613 is a wasteful number, since it uses less digits than its factorization.

31445613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3493963 (or 3493960 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 31445613 is about 5607.6388079119. The cubic root of 31445613 is about 315.6361144078.

The spelling of 31445613 in words is "thirty-one million, four hundred forty-five thousand, six hundred thirteen".