231389401 has 4 divisors (see below), whose sum is σ = 232942500. Its totient is φ = 229836304.

The previous prime is 231389399. The next prime is 231389419. The reversal of 231389401 is 104983132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 98010000 + 133379401 = 9900^2 + 11549^2 .

It is a cyclic number.

It is not a de Polignac number, because 231389401 - 2¹ = 231389399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231389461) 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, 776326 + ... + 776623.

It is an arithmetic number, because the mean of its divisors is an integer number (58235625).

Almost surely, 2^231389401 is an apocalyptic number.

It is an amenable number.

231389401 is a deficient number, since it is larger than the sum of its proper divisors (1553099).

231389401 is a wasteful number, since it uses less digits than its factorization.

231389401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553098.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 231389401 is about 15211.4891118523. The cubic root of 231389401 is about 613.9238244012.

The spelling of 231389401 in words is "two hundred thirty-one million, three hundred eighty-nine thousand, four hundred one".