31420065 has 16 divisors (see below), whose sum is σ = 50879808. Its totient is φ = 16554816.

The previous prime is 31420033. The next prime is 31420069. The reversal of 31420065 is 56002413.

It is a happy number.

It is not a de Polignac number, because 31420065 - 2⁵ = 31420033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31420069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11374 + ... + 13863.

It is an arithmetic number, because the mean of its divisors is an integer number (3179988).

Almost surely, 2^31420065 is an apocalyptic number.

It is an amenable number.

31420065 is a deficient number, since it is larger than the sum of its proper divisors (19459743).

31420065 is a wasteful number, since it uses less digits than its factorization.

31420065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25328.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 31420065 is about 5605.3603809211. The cubic root of 31420065 is about 315.5506116885.

Adding to 31420065 its reverse (56002413), we get a palindrome (87422478).

The spelling of 31420065 in words is "thirty-one million, four hundred twenty thousand, sixty-five".