31431340025 has 6 divisors (see below), whose sum is σ = 38974861662. Its totient is φ = 25145072000.

The previous prime is 31431340021. The next prime is 31431340027. The reversal of 31431340025 is 52004313413.

It can be written as a sum of positive squares in 3 ways, for example, as 438441721 + 30992898304 = 20939^2 + 176048^2 .

It is not a de Polignac number, because 31431340025 - 2² = 31431340021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31431339976 and 31431340003.

It is not an unprimeable number, because it can be changed into a prime (31431340021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 628626776 + ... + 628626825.

It is an arithmetic number, because the mean of its divisors is an integer number (6495810277).

Almost surely, 2^31431340025 is an apocalyptic number.

It is an amenable number.

31431340025 is a deficient number, since it is larger than the sum of its proper divisors (7543521637).

31431340025 is a wasteful number, since it uses less digits than its factorization.

31431340025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1257253611 (or 1257253606 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 31431340025 its reverse (52004313413), we get a palindrome (83435653438).

The spelling of 31431340025 in words is "thirty-one billion, four hundred thirty-one million, three hundred forty thousand, twenty-five".