16538251 has 2 divisors, whose sum is σ = 16538252. Its totient is φ = 16538250.

The previous prime is 16538239. The next prime is 16538261. The reversal of 16538251 is 15283561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16538251 - 2⁹ = 16537739 is a prime.

It is a super-2 number, since 2×16538251² = 547027492278002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16538201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8269125 + 8269126.

It is an arithmetic number, because the mean of its divisors is an integer number (8269126).

Almost surely, 2^16538251 is an apocalyptic number.

16538251 is a deficient number, since it is larger than the sum of its proper divisors (1).

16538251 is an equidigital number, since it uses as much as digits as its factorization.

16538251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

The square root of 16538251 is about 4066.7248493106. The cubic root of 16538251 is about 254.7787443854.

It can be divided in two parts, 165 and 38251, that added together give a 4-th power (38416 = 14⁴).

The spelling of 16538251 in words is "sixteen million, five hundred thirty-eight thousand, two hundred fifty-one".