31251322540 has 12 divisors (see below), whose sum is σ = 65627777376. Its totient is φ = 12500529008.

The previous prime is 31251322517. The next prime is 31251322541. The reversal of 31251322540 is 4522315213.

It is a super-2 number, since 2×31251322540² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31251322499 and 31251322508.

It is not an unprimeable number, because it can be changed into a prime (31251322541) 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 3 ways as a sum of consecutive naturals, for example, 781283044 + ... + 781283083.

It is an arithmetic number, because the mean of its divisors is an integer number (5468981448).

Almost surely, 2^31251322540 is an apocalyptic number.

It is an amenable number.

31251322540 is an abundant number, since it is smaller than the sum of its proper divisors (34376454836).

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

31251322540 is a wasteful number, since it uses less digits than its factorization.

31251322540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562566136 (or 1562566134 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 31251322540 its reverse (4522315213), we get a palindrome (35773637753).

The spelling of 31251322540 in words is "thirty-one billion, two hundred fifty-one million, three hundred twenty-two thousand, five hundred forty".