31431401344202 has 4 divisors (see below), whose sum is σ = 47147102016306. Its totient is φ = 15715700672100.

The previous prime is 31431401344141. The next prime is 31431401344283. The reversal of 31431401344202 is 20244310413413.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 27317964302281 + 4113437041921 = 5226659^2 + 2028161^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7857850336049 + ... + 7857850336052.

Almost surely, 2^{31431401344202} is an apocalyptic number.

31431401344202 is a deficient number, since it is larger than the sum of its proper divisors (15715700672104).

31431401344202 is a wasteful number, since it uses less digits than its factorization.

31431401344202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15715700672103.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 31431401344202 its reverse (20244310413413), we get a palindrome (51675711757615).

The spelling of 31431401344202 in words is "thirty-one trillion, four hundred thirty-one billion, four hundred one million, three hundred forty-four thousand, two hundred two".