31545243321 has 8 divisors (see below), whose sum is σ = 42084770784. Its totient is φ = 21017939040.

The previous prime is 31545243307. The next prime is 31545243329. The reversal of 31545243321 is 12334254513.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31545243321 - 2¹³ = 31545235129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31545243329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3049771 + ... + 3060096.

It is an arithmetic number, because the mean of its divisors is an integer number (5260596348).

Almost surely, 2^31545243321 is an apocalyptic number.

It is an amenable number.

31545243321 is a deficient number, since it is larger than the sum of its proper divisors (10539527463).

31545243321 is a wasteful number, since it uses less digits than its factorization.

31545243321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6111591.

The product of its digits is 43200, while the sum is 33.

Adding to 31545243321 its reverse (12334254513), we get a palindrome (43879497834).

The spelling of 31545243321 in words is "thirty-one billion, five hundred forty-five million, two hundred forty-three thousand, three hundred twenty-one".