31380605 has 8 divisors (see below), whose sum is σ = 37711872. Its totient is φ = 25067728.

The previous prime is 31380563. The next prime is 31380607. The reversal of 31380605 is 50608313.

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 31380605 - 2⁶ = 31380541 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 (31380607) 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 7 ways as a sum of consecutive naturals, for example, 509 + ... + 7938.

It is an arithmetic number, because the mean of its divisors is an integer number (4713984).

Almost surely, 2^31380605 is an apocalyptic number.

It is an amenable number.

31380605 is a deficient number, since it is larger than the sum of its proper divisors (6331267).

31380605 is an equidigital number, since it uses as much as digits as its factorization.

31380605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9195.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 31380605 is about 5601.8394300444. The cubic root of 31380605 is about 315.4184578840.

Adding to 31380605 its reverse (50608313), we get a palindrome (81988918).

The spelling of 31380605 in words is "thirty-one million, three hundred eighty thousand, six hundred five".