31145321540 has 12 divisors (see below), whose sum is σ = 65405175276. Its totient is φ = 12458128608.

The previous prime is 31145321507. The next prime is 31145321573. The reversal of 31145321540 is 4512354113.

It is an interprime number because it is at equal distance from previous prime (31145321507) and next prime (31145321573).

It can be written as a sum of positive squares in 2 ways, for example, as 24187092484 + 6958229056 = 155522^2 + 83416^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 778633019 + ... + 778633058.

It is an arithmetic number, because the mean of its divisors is an integer number (5450431273).

Almost surely, 2^31145321540 is an apocalyptic number.

It is an amenable number.

31145321540 is an abundant number, since it is smaller than the sum of its proper divisors (34259853736).

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

31145321540 is a wasteful number, since it uses less digits than its factorization.

31145321540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557266086 (or 1557266084 counting only the distinct ones).

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

Adding to 31145321540 its reverse (4512354113), we get a palindrome (35657675653).

The spelling of 31145321540 in words is "thirty-one billion, one hundred forty-five million, three hundred twenty-one thousand, five hundred forty".