31472427409 has 2 divisors, whose sum is σ = 31472427410. Its totient is φ = 31472427408.

The previous prime is 31472427391. The next prime is 31472427433. The reversal of 31472427409 is 90472427413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28374391809 + 3098035600 = 168447^2 + 55660^2 .

It is an emirp because it is prime and its reverse (90472427413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31472427409 - 2⁵ = 31472427377 is a prime.

It is not a weakly prime, because it can be changed into another prime (31472427479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15736213704 + 15736213705.

It is an arithmetic number, because the mean of its divisors is an integer number (15736213705).

Almost surely, 2^31472427409 is an apocalyptic number.

It is an amenable number.

31472427409 is a deficient number, since it is larger than the sum of its proper divisors (1).

31472427409 is an equidigital number, since it uses as much as digits as its factorization.

31472427409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 43.

The spelling of 31472427409 in words is "thirty-one billion, four hundred seventy-two million, four hundred twenty-seven thousand, four hundred nine".