231481155901 has 4 divisors (see below), whose sum is σ = 231489243712. Its totient is φ = 231473068092.

The previous prime is 231481155821. The next prime is 231481155943. The reversal of 231481155901 is 109551184132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231481155901 - 2²³ = 231472767293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231481155991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4000821 + ... + 4058266.

It is an arithmetic number, because the mean of its divisors is an integer number (57872310928).

Almost surely, 2^231481155901 is an apocalyptic number.

It is an amenable number.

231481155901 is a deficient number, since it is larger than the sum of its proper divisors (8087811).

231481155901 is an equidigital number, since it uses as much as digits as its factorization.

231481155901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8087810.

The product of its (nonzero) digits is 43200, while the sum is 40.

The spelling of 231481155901 in words is "two hundred thirty-one billion, four hundred eighty-one million, one hundred fifty-five thousand, nine hundred one".