31140409 has 2 divisors, whose sum is σ = 31140410. Its totient is φ = 31140408.

The previous prime is 31140407. The next prime is 31140419. The reversal of 31140409 is 90404113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17040384 + 14100025 = 4128^2 + 3755^2 .

It is a cyclic number.

It is not a de Polignac number, because 31140409 - 2¹ = 31140407 is a prime.

Together with 31140407, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 31140409.

It is not a weakly prime, because it can be changed into another prime (31140401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15570204 + 15570205.

It is an arithmetic number, because the mean of its divisors is an integer number (15570205).

Almost surely, 2^31140409 is an apocalyptic number.

It is an amenable number.

31140409 is a deficient number, since it is larger than the sum of its proper divisors (1).

31140409 is an equidigital number, since it uses as much as digits as its factorization.

31140409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 31140409 is about 5580.3592178282. The cubic root of 31140409 is about 314.6116285276.

The spelling of 31140409 in words is "thirty-one million, one hundred forty thousand, four hundred nine".