31442605 has 8 divisors (see below), whose sum is σ = 39950712. Its totient is φ = 23674368.

The previous prime is 31442591. The next prime is 31442617. The reversal of 31442605 is 50624413.

It can be written as a sum of positive squares in 4 ways, for example, as 1532644 + 29909961 = 1238^2 + 5469^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31442605 - 2¹⁵ = 31409837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31442605.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 184872 + ... + 185041.

It is an arithmetic number, because the mean of its divisors is an integer number (4993839).

Almost surely, 2^31442605 is an apocalyptic number.

It is an amenable number.

31442605 is a deficient number, since it is larger than the sum of its proper divisors (8508107).

31442605 is a wasteful number, since it uses less digits than its factorization.

31442605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369935.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 31442605 is about 5607.3705959211. The cubic root of 31442605 is about 315.6260497955.

The spelling of 31442605 in words is "thirty-one million, four hundred forty-two thousand, six hundred five".