231551431223154 has 64 divisors (see below), whose sum is σ = 540146343905280. Its totient is φ = 64804791461760.

The previous prime is 231551431223153. The next prime is 231551431223173. The reversal of 231551431223154 is 451322134155132.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (231551431223153) 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, 165572134 + ... + 166964769.

It is an arithmetic number, because the mean of its divisors is an integer number (8439786623520).

Almost surely, 2^{231551431223154} is an apocalyptic number.

231551431223154 is an abundant number, since it is smaller than the sum of its proper divisors (308594912682126).

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

231551431223154 is a wasteful number, since it uses less digits than its factorization.

231551431223154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332537255.

The product of its digits is 432000, while the sum is 42.

Adding to 231551431223154 its reverse (451322134155132), we get a palindrome (682873565378286).

The spelling of 231551431223154 in words is "two hundred thirty-one trillion, five hundred fifty-one billion, four hundred thirty-one million, two hundred twenty-three thousand, one hundred fifty-four".