31961005 has 8 divisors (see below), whose sum is σ = 38893824. Its totient is φ = 25208400.

The previous prime is 31960979. The next prime is 31961009. The reversal of 31961005 is 50016913.

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

It is not a de Polignac number, because 31961005 - 2²³ = 23572397 is a prime.

It is a super-2 number, since 2×31961005² = 2043011681220050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31961009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44661 + ... + 45370.

It is an arithmetic number, because the mean of its divisors is an integer number (4861728).

Almost surely, 2^31961005 is an apocalyptic number.

It is an amenable number.

31961005 is a deficient number, since it is larger than the sum of its proper divisors (6932819).

31961005 is an equidigital number, since it uses as much as digits as its factorization.

31961005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90107.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 31961005 is about 5653.4064952027. The cubic root of 31961005 is about 317.3511981749.

Adding to 31961005 its reverse (50016913), we get a palindrome (81977918).

The spelling of 31961005 in words is "thirty-one million, nine hundred sixty-one thousand, five".