31440001 has 2 divisors, whose sum is σ = 31440002. Its totient is φ = 31440000.

The previous prime is 31439977. The next prime is 31440049. The reversal of 31440001 is 10004413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31136400 + 303601 = 5580^2 + 551^2 .

It is a cyclic number.

It is not a de Polignac number, because 31440001 - 2²¹ = 29342849 is a prime.

It is not a weakly prime, because it can be changed into another prime (31440061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15720000 + 15720001.

It is an arithmetic number, because the mean of its divisors is an integer number (15720001).

Almost surely, 2^31440001 is an apocalyptic number.

It is an amenable number.

31440001 is a deficient number, since it is larger than the sum of its proper divisors (1).

31440001 is an equidigital number, since it uses as much as digits as its factorization.

31440001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 31440001 is about 5607.1383967225. The cubic root of 31440001 is about 315.6173364280.

Adding to 31440001 its reverse (10004413), we get a palindrome (41444414).

The spelling of 31440001 in words is "thirty-one million, four hundred forty thousand, one".