31144430402 has 4 divisors (see below), whose sum is σ = 46716645606. Its totient is φ = 15572215200.

The previous prime is 31144430377. The next prime is 31144430407. The reversal of 31144430402 is 20403444113.

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., 29172981601 + 1971448801 = 170801^2 + 44401^2 .

It is not an unprimeable number, because it can be changed into a prime (31144430407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7786107599 + ... + 7786107602.

Almost surely, 2^31144430402 is an apocalyptic number.

31144430402 is a deficient number, since it is larger than the sum of its proper divisors (15572215204).

31144430402 is a wasteful number, since it uses less digits than its factorization.

31144430402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15572215203.

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

Adding to 31144430402 its reverse (20403444113), we get a palindrome (51547874515).

The spelling of 31144430402 in words is "thirty-one billion, one hundred forty-four million, four hundred thirty thousand, four hundred two".