31403122000 has 80 divisors (see below), whose sum is σ = 76685051664. Its totient is φ = 12436800000.

The previous prime is 31403121977. The next prime is 31403122001. The reversal of 31403122000 is 22130413.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 55711296 + 31347410704 = 7464^2 + 177052^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31403122001) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 124270 + ... + 279730.

Almost surely, 2^31403122000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31403122000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38342525832).

31403122000 is an abundant number, since it is smaller than the sum of its proper divisors (45281929664).

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

31403122000 is a wasteful number, since it uses less digits than its factorization.

31403122000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155585 (or 155569 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 31403122000 its reverse (22130413), we get a palindrome (31425252413).

The spelling of 31403122000 in words is "thirty-one billion, four hundred three million, one hundred twenty-two thousand".