31431422402 has 8 divisors (see below), whose sum is σ = 47613937212. Its totient is φ = 15560110000.

The previous prime is 31431422401. The next prime is 31431422441. The reversal of 31431422402 is 20422413413.

It can be written as a sum of positive squares in 2 ways, for example, as 25956754321 + 5474668081 = 161111^2 + 73991^2 .

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

It is not an unprimeable number, because it can be changed into a prime (31431422401) 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, 77800349 + ... + 77800752.

Almost surely, 2^31431422402 is an apocalyptic number.

31431422402 is a deficient number, since it is larger than the sum of its proper divisors (16182514810).

31431422402 is a wasteful number, since it uses less digits than its factorization.

31431422402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155601204.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 31431422402 its reverse (20422413413), we get a palindrome (51853835815).

The spelling of 31431422402 in words is "thirty-one billion, four hundred thirty-one million, four hundred twenty-two thousand, four hundred two".