31030409 has 2 divisors, whose sum is σ = 31030410. Its totient is φ = 31030408.

The previous prime is 31030393. The next prime is 31030429. The reversal of 31030409 is 90403013.

It is an a-pointer prime, because the next prime (31030429) can be obtained adding 31030409 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15976009 + 15054400 = 3997^2 + 3880^2 .

It is a cyclic number.

It is not a de Polignac number, because 31030409 - 2⁴ = 31030393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31030429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15515204 + 15515205.

It is an arithmetic number, because the mean of its divisors is an integer number (15515205).

Almost surely, 2^31030409 is an apocalyptic number.

It is an amenable number.

31030409 is a deficient number, since it is larger than the sum of its proper divisors (1).

31030409 is an equidigital number, since it uses as much as digits as its factorization.

31030409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 31030409 is about 5570.4945022861. The cubic root of 31030409 is about 314.2407480631.

The spelling of 31030409 in words is "thirty-one million, thirty thousand, four hundred nine".