31187140809 has 8 divisors (see below), whose sum is σ = 45363113952. Its totient is φ = 18901297440.

The previous prime is 31187140801. The next prime is 31187140841. The reversal of 31187140809 is 90804178113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31187140809 - 2³ = 31187140801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31187140801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472532404 + ... + 472532469.

It is an arithmetic number, because the mean of its divisors is an integer number (5670389244).

Almost surely, 2^31187140809 is an apocalyptic number.

It is an amenable number.

31187140809 is a deficient number, since it is larger than the sum of its proper divisors (14175973143).

31187140809 is a wasteful number, since it uses less digits than its factorization.

31187140809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945064887.

The product of its (nonzero) digits is 48384, while the sum is 42.

The spelling of 31187140809 in words is "thirty-one billion, one hundred eighty-seven million, one hundred forty thousand, eight hundred nine".