31470409 has 2 divisors, whose sum is σ = 31470410. Its totient is φ = 31470408.

The previous prime is 31470379. The next prime is 31470443. The reversal of 31470409 is 90407413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30525625 + 944784 = 5525^2 + 972^2 .

It is a cyclic number.

It is not a de Polignac number, because 31470409 - 2¹³ = 31462217 is a prime.

It is not a weakly prime, because it can be changed into another prime (31470469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15735204 + 15735205.

It is an arithmetic number, because the mean of its divisors is an integer number (15735205).

Almost surely, 2^31470409 is an apocalyptic number.

It is an amenable number.

31470409 is a deficient number, since it is larger than the sum of its proper divisors (1).

31470409 is an equidigital number, since it uses as much as digits as its factorization.

31470409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 31470409 is about 5609.8492849630. The cubic root of 31470409 is about 315.7190560976.

The spelling of 31470409 in words is "thirty-one million, four hundred seventy thousand, four hundred nine".