31572155641 has 6 divisors (see below), whose sum is σ = 34187600670. Its totient is φ = 29143528128.

The previous prime is 31572155639. The next prime is 31572155651. The reversal of 31572155641 is 14655127513.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 4201762041 + 27370393600 = 64821^2 + 165440^2 .

It is not a de Polignac number, because 31572155641 - 2¹ = 31572155639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31572155594 and 31572155603.

It is not an unprimeable number, because it can be changed into a prime (31572155621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 93408576 + ... + 93408913.

It is an arithmetic number, because the mean of its divisors is an integer number (5697933445).

Almost surely, 2^31572155641 is an apocalyptic number.

It is an amenable number.

31572155641 is a deficient number, since it is larger than the sum of its proper divisors (2615445029).

31572155641 is a wasteful number, since it uses less digits than its factorization.

31572155641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186817515 (or 186817502 counting only the distinct ones).

The product of its digits is 126000, while the sum is 40.

The spelling of 31572155641 in words is "thirty-one billion, five hundred seventy-two million, one hundred fifty-five thousand, six hundred forty-one".