231056389 has 2 divisors, whose sum is σ = 231056390. Its totient is φ = 231056388.

The previous prime is 231056383. The next prime is 231056407. The reversal of 231056389 is 983650132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230523489 + 532900 = 15183^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 231056389 - 2³ = 231056381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231056381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115528194 + 115528195.

It is an arithmetic number, because the mean of its divisors is an integer number (115528195).

Almost surely, 2^231056389 is an apocalyptic number.

It is an amenable number.

231056389 is a deficient number, since it is larger than the sum of its proper divisors (1).

231056389 is an equidigital number, since it uses as much as digits as its factorization.

231056389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 231056389 is about 15200.5391022819. The cubic root of 231056389 is about 613.6291664843.

The spelling of 231056389 in words is "two hundred thirty-one million, fifty-six thousand, three hundred eighty-nine".