31201020144 has 60 divisors (see below), whose sum is σ = 99793742256. Its totient is φ = 8914576896.

The previous prime is 31201020143. The next prime is 31201020173. The reversal of 31201020144 is 44102010213.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31201020143) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15475689 + ... + 15477704.

Almost surely, 2^31201020144 is an apocalyptic number.

It is an amenable number.

31201020144 is an abundant number, since it is smaller than the sum of its proper divisors (68592722112).

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

31201020144 is a wasteful number, since it uses less digits than its factorization.

31201020144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30953414 (or 30953405 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 31201020144 its reverse (44102010213), we get a palindrome (75303030357).

The spelling of 31201020144 in words is "thirty-one billion, two hundred one million, twenty thousand, one hundred forty-four".