31405742009 has 16 divisors (see below), whose sum is σ = 32598680640. Its totient is φ = 30220344000.

The previous prime is 31405742003. The next prime is 31405742057. The reversal of 31405742009 is 90024750413.

It is a cyclic number.

It is not a de Polignac number, because 31405742009 - 2⁴ = 31405741993 is a prime.

It is a super-2 number, since 2×31405742009² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31405742009.

It is not an unprimeable number, because it can be changed into a prime (31405742003) 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, 13244594 + ... + 13246964.

It is an arithmetic number, because the mean of its divisors is an integer number (2037417540).

Almost surely, 2^31405742009 is an apocalyptic number.

It is an amenable number.

31405742009 is a deficient number, since it is larger than the sum of its proper divisors (1192938631).

31405742009 is a wasteful number, since it uses less digits than its factorization.

31405742009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3752.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 31405742009 in words is "thirty-one billion, four hundred five million, seven hundred forty-two thousand, nine".