16117251 has 4 divisors (see below), whose sum is σ = 21489672. Its totient is φ = 10744832.

The previous prime is 16117151. The next prime is 16117253. The reversal of 16117251 is 15271161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15271161 = 3 ⋅5090387.

It is a cyclic number.

It is not a de Polignac number, because 16117251 - 2⁹ = 16116739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16117253) 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, 2686206 + ... + 2686211.

It is an arithmetic number, because the mean of its divisors is an integer number (5372418).

Almost surely, 2^16117251 is an apocalyptic number.

16117251 is a deficient number, since it is larger than the sum of its proper divisors (5372421).

16117251 is an equidigital number, since it uses as much as digits as its factorization.

16117251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5372420.

The product of its digits is 420, while the sum is 24.

The square root of 16117251 is about 4014.6296217709. The cubic root of 16117251 is about 252.5982416788.

It can be divided in two parts, 1611 and 7251, that multiplied together give a triangular number (11681361 = T₄₈₃₃).

The spelling of 16117251 in words is "sixteen million, one hundred seventeen thousand, two hundred fifty-one".