231967901 has 4 divisors (see below), whose sum is σ = 253055904. Its totient is φ = 210879900.

The previous prime is 231967891. The next prime is 231967919. The reversal of 231967901 is 109769132.

It is a happy number.

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 not a de Polignac number, because 231967901 - 2¹⁸ = 231705757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231967991) 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, 10543985 + ... + 10544006.

It is an arithmetic number, because the mean of its divisors is an integer number (63263976).

Almost surely, 2^231967901 is an apocalyptic number.

It is an amenable number.

231967901 is a deficient number, since it is larger than the sum of its proper divisors (21088003).

231967901 is a wasteful number, since it uses less digits than its factorization.

231967901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21088002.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 231967901 is about 15230.4924739813. The cubic root of 231967901 is about 614.4350252388.

The spelling of 231967901 in words is "two hundred thirty-one million, nine hundred sixty-seven thousand, nine hundred one".