230621557 has 4 divisors (see below), whose sum is σ = 231063040. Its totient is φ = 230180076.

The previous prime is 230621551. The next prime is 230621579. The reversal of 230621557 is 755126032.

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 230621557 - 2¹⁵ = 230588789 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 (230621551) 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, 219957 + ... + 221002.

It is an arithmetic number, because the mean of its divisors is an integer number (57765760).

Almost surely, 2^230621557 is an apocalyptic number.

It is an amenable number.

230621557 is a deficient number, since it is larger than the sum of its proper divisors (441483).

230621557 is an equidigital number, since it uses as much as digits as its factorization.

230621557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441482.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 230621557 is about 15186.2291896310. The cubic root of 230621557 is about 613.2439890009.

Adding to 230621557 its reverse (755126032), we get a palindrome (985747589).

The spelling of 230621557 in words is "two hundred thirty million, six hundred twenty-one thousand, five hundred fifty-seven".