31901135040 has 112 divisors (see below), whose sum is σ = 112540145760. Its totient is φ = 8506967040.

The previous prime is 31901135009. The next prime is 31901135041. The reversal of 31901135040 is 4053110913.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 31901134995 and 31901135013.

It is not an unprimeable number, because it can be changed into a prime (31901135041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1837491 + ... + 1854770.

It is an arithmetic number, because the mean of its divisors is an integer number (1004822730).

Almost surely, 2^31901135040 is an apocalyptic number.

31901135040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31901135040 is an abundant number, since it is smaller than the sum of its proper divisors (80639010720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31901135040 is a wasteful number, since it uses less digits than its factorization.

31901135040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3692287 (or 3692271 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

Adding to 31901135040 its reverse (4053110913), we get a palindrome (35954245953).

The spelling of 31901135040 in words is "thirty-one billion, nine hundred one million, one hundred thirty-five thousand, forty".