31423002136 has 32 divisors (see below), whose sum is σ = 60668720640. Its totient is φ = 15246897408.

The previous prime is 31423002131. The next prime is 31423002139. The reversal of 31423002136 is 63120032413.

It is a self number, because there is not a number n which added to its sum of digits gives 31423002136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31423002131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25221 + ... + 251956.

It is an arithmetic number, because the mean of its divisors is an integer number (1895897520).

Almost surely, 2^31423002136 is an apocalyptic number.

It is an amenable number.

31423002136 is a deficient number, since it is larger than the sum of its proper divisors (29245718504).

31423002136 is a wasteful number, since it uses less digits than its factorization.

31423002136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277603 (or 277599 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 31423002136 its reverse (63120032413), we get a palindrome (94543034549).

The spelling of 31423002136 in words is "thirty-one billion, four hundred twenty-three million, two thousand, one hundred thirty-six".