31461308787 has 4 divisors (see below), whose sum is σ = 41948411720. Its totient is φ = 20974205856.

The previous prime is 31461308773. The next prime is 31461308843. The reversal of 31461308787 is 78780316413.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 31461308787 - 2⁸ = 31461308531 is a prime.

It is a super-2 number, since 2×31461308787² (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 (31461308687) 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, 5243551462 + ... + 5243551467.

It is an arithmetic number, because the mean of its divisors is an integer number (10487102930).

Almost surely, 2^31461308787 is an apocalyptic number.

31461308787 is a deficient number, since it is larger than the sum of its proper divisors (10487102933).

31461308787 is a wasteful number, since it uses less digits than its factorization.

31461308787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10487102932.

The product of its (nonzero) digits is 677376, while the sum is 48.

The spelling of 31461308787 in words is "thirty-one billion, four hundred sixty-one million, three hundred eight thousand, seven hundred eighty-seven".