31532321145 has 32 divisors (see below), whose sum is σ = 54371116800. Its totient is φ = 15512603904.

The previous prime is 31532321137. The next prime is 31532321147. The reversal of 31532321145 is 54112323513.

It is not a de Polignac number, because 31532321145 - 2³ = 31532321137 is a prime.

It is a super-2 number, since 2×31532321145² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31532321147) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 222076 + ... + 335234.

It is an arithmetic number, because the mean of its divisors is an integer number (1699097400).

Almost surely, 2^31532321145 is an apocalyptic number.

It is an amenable number.

31532321145 is a deficient number, since it is larger than the sum of its proper divisors (22838795655).

31532321145 is a wasteful number, since it uses less digits than its factorization.

31532321145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114609.

The product of its digits is 10800, while the sum is 30.

Adding to 31532321145 its reverse (54112323513), we get a palindrome (85644644658).

The spelling of 31532321145 in words is "thirty-one billion, five hundred thirty-two million, three hundred twenty-one thousand, one hundred forty-five".