231628901 has 4 divisors (see below), whose sum is σ = 264718752. Its totient is φ = 198539052.

The previous prime is 231628889. The next prime is 231628907. The reversal of 231628901 is 109826132.

231628901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 231628901 - 2¹⁴ = 231612517 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 (231628907) 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, 16544915 + ... + 16544928.

It is an arithmetic number, because the mean of its divisors is an integer number (66179688).

Almost surely, 2^231628901 is an apocalyptic number.

It is an amenable number.

231628901 is a deficient number, since it is larger than the sum of its proper divisors (33089851).

231628901 is an equidigital number, since it uses as much as digits as its factorization.

231628901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33089850.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 231628901 is about 15219.3594149031. The cubic root of 231628901 is about 614.1355656693.

The spelling of 231628901 in words is "two hundred thirty-one million, six hundred twenty-eight thousand, nine hundred one".