31402156642 has 8 divisors (see below), whose sum is σ = 47569603932. Its totient is φ = 15545622000.

The previous prime is 31402156631. The next prime is 31402156649. The reversal of 31402156642 is 24665120413.

It can be written as a sum of positive squares in 2 ways, for example, as 31378933881 + 23222761 = 177141^2 + 4819^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 31402156598 and 31402156607.

It is not an unprimeable number, because it can be changed into a prime (31402156649) 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, 77727909 + ... + 77728312.

Almost surely, 2^31402156642 is an apocalyptic number.

31402156642 is a deficient number, since it is larger than the sum of its proper divisors (16167447290).

31402156642 is a wasteful number, since it uses less digits than its factorization.

31402156642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155456324.

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 31402156642 in words is "thirty-one billion, four hundred two million, one hundred fifty-six thousand, six hundred forty-two".