31363532809 has 4 divisors (see below), whose sum is σ = 35844037504. Its totient is φ = 26883028116.

The previous prime is 31363532801. The next prime is 31363532819. The reversal of 31363532809 is 90823536313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90823536313 = 859 ⋅105731707.

It is not a de Polignac number, because 31363532809 - 2³ = 31363532801 is a prime.

It is a super-2 number, since 2×31363532809² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31363532801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2240252337 + ... + 2240252350.

It is an arithmetic number, because the mean of its divisors is an integer number (8961009376).

Almost surely, 2^31363532809 is an apocalyptic number.

It is an amenable number.

31363532809 is a deficient number, since it is larger than the sum of its proper divisors (4480504695).

31363532809 is an equidigital number, since it uses as much as digits as its factorization.

31363532809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4480504694.

The product of its (nonzero) digits is 349920, while the sum is 43.

The spelling of 31363532809 in words is "thirty-one billion, three hundred sixty-three million, five hundred thirty-two thousand, eight hundred nine".