31253142420 has 36 divisors (see below), whose sum is σ = 94801199220. Its totient is φ = 8334171264.

The previous prime is 31253142409. The next prime is 31253142439. The reversal of 31253142420 is 2424135213.

It can be written as a sum of positive squares in 2 ways, for example, as 6293566224 + 24959576196 = 79332^2 + 157986^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×31253142420² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86814105 + ... + 86814464.

It is an arithmetic number, because the mean of its divisors is an integer number (2633366645).

Almost surely, 2^31253142420 is an apocalyptic number.

31253142420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31253142420 is an abundant number, since it is smaller than the sum of its proper divisors (63548056800).

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

31253142420 is a wasteful number, since it uses less digits than its factorization.

31253142420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173628584 (or 173628579 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 31253142420 its reverse (2424135213), we get a palindrome (33677277633).

The spelling of 31253142420 in words is "thirty-one billion, two hundred fifty-three million, one hundred forty-two thousand, four hundred twenty".