31421237605 has 8 divisors (see below), whose sum is σ = 37734744600. Its totient is φ = 25117483776.

The previous prime is 31421237597. The next prime is 31421237621. The reversal of 31421237605 is 50673212413.

It can be written as a sum of positive squares in 4 ways, for example, as 18670762881 + 12750474724 = 136641^2 + 112918^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 31421237605 - 2³ = 31421237597 is a prime.

It is a super-2 number, since 2×31421237605² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2431200 + ... + 2444089.

It is an arithmetic number, because the mean of its divisors is an integer number (4716843075).

Almost surely, 2^31421237605 is an apocalyptic number.

It is an amenable number.

31421237605 is a deficient number, since it is larger than the sum of its proper divisors (6313506995).

31421237605 is a wasteful number, since it uses less digits than its factorization.

31421237605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4876583.

The product of its (nonzero) digits is 30240, while the sum is 34.

The spelling of 31421237605 in words is "thirty-one billion, four hundred twenty-one million, two hundred thirty-seven thousand, six hundred five".