31442156771 has 4 divisors (see below), whose sum is σ = 31591171944. Its totient is φ = 31293141600.

The previous prime is 31442156743. The next prime is 31442156789. The reversal of 31442156771 is 17765124413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17765124413 = 29 ⋅612590497.

It is a cyclic number.

It is not a de Polignac number, because 31442156771 - 2³⁴ = 14262287587 is a prime.

It is a super-2 number, since 2×31442156771² (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 (31442150771) 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, 74507270 + ... + 74507691.

It is an arithmetic number, because the mean of its divisors is an integer number (7897792986).

Almost surely, 2^31442156771 is an apocalyptic number.

31442156771 is a deficient number, since it is larger than the sum of its proper divisors (149015173).

31442156771 is a wasteful number, since it uses less digits than its factorization.

31442156771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149015172.

The product of its digits is 141120, while the sum is 41.

The spelling of 31442156771 in words is "thirty-one billion, four hundred forty-two million, one hundred fifty-six thousand, seven hundred seventy-one".