31072420709 has 16 divisors (see below), whose sum is σ = 34078248960. Its totient is φ = 28097118000.

The previous prime is 31072420693. The next prime is 31072420711. The reversal of 31072420709 is 90702427013.

It is a cyclic number.

It is not a de Polignac number, because 31072420709 - 2⁴ = 31072420693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31072420739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1872752 + ... + 1889270.

It is an arithmetic number, because the mean of its divisors is an integer number (2129890560).

Almost surely, 2^31072420709 is an apocalyptic number.

It is an amenable number.

31072420709 is a deficient number, since it is larger than the sum of its proper divisors (3005828251).

31072420709 is a wasteful number, since it uses less digits than its factorization.

31072420709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17432.

The product of its (nonzero) digits is 21168, while the sum is 35.

The spelling of 31072420709 in words is "thirty-one billion, seventy-two million, four hundred twenty thousand, seven hundred nine".