16231557 has 4 divisors (see below), whose sum is σ = 21642080. Its totient is φ = 10821036.

The previous prime is 16231547. The next prime is 16231559. The reversal of 16231557 is 75513261.

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 16231557 - 2¹² = 16227461 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 (16231559) 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, 2705257 + ... + 2705262.

It is an arithmetic number, because the mean of its divisors is an integer number (5410520).

Almost surely, 2^16231557 is an apocalyptic number.

It is an amenable number.

16231557 is a deficient number, since it is larger than the sum of its proper divisors (5410523).

16231557 is an equidigital number, since it uses as much as digits as its factorization.

16231557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5410522.

The product of its digits is 6300, while the sum is 30.

The square root of 16231557 is about 4028.8406520983. The cubic root of 16231557 is about 253.1939905833.

The spelling of 16231557 in words is "sixteen million, two hundred thirty-one thousand, five hundred fifty-seven".