31531001405420 has 24 divisors (see below), whose sum is σ = 72234657765648. Its totient is φ = 11465818692800.

The previous prime is 31531001405419. The next prime is 31531001405429. The reversal of 31531001405420 is 2450410013513.

It is not an unprimeable number, because it can be changed into a prime (31531001405429) 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, 71661366611 + ... + 71661367050.

It is an arithmetic number, because the mean of its divisors is an integer number (3009777406902).

Almost surely, 2^{31531001405420} is an apocalyptic number.

It is an amenable number.

31531001405420 is an abundant number, since it is smaller than the sum of its proper divisors (40703656360228).

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

31531001405420 is a wasteful number, since it uses less digits than its factorization.

31531001405420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143322733681 (or 143322733679 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 31531001405420 its reverse (2450410013513), we get a palindrome (33981411418933).

The spelling of 31531001405420 in words is "thirty-one trillion, five hundred thirty-one billion, one million, four hundred five thousand, four hundred twenty".