31475009 has 2 divisors, whose sum is σ = 31475010. Its totient is φ = 31475008.

The previous prime is 31474999. The next prime is 31475029. The reversal of 31475009 is 90057413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31080625 + 394384 = 5575^2 + 628^2 .

It is an emirp because it is prime and its reverse (90057413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31475009 - 2¹² = 31470913 is a prime.

It is not a weakly prime, because it can be changed into another prime (31475029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15737504 + 15737505.

It is an arithmetic number, because the mean of its divisors is an integer number (15737505).

Almost surely, 2^31475009 is an apocalyptic number.

It is an amenable number.

31475009 is a deficient number, since it is larger than the sum of its proper divisors (1).

31475009 is an equidigital number, since it uses as much as digits as its factorization.

31475009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 31475009 is about 5610.2592631714. The cubic root of 31475009 is about 315.7344381337.

The spelling of 31475009 in words is "thirty-one million, four hundred seventy-five thousand, nine".