16158121 has 8 divisors (see below), whose sum is σ = 19269504. Its totient is φ = 13247520.

The previous prime is 16158091. The next prime is 16158179. The reversal of 16158121 is 12185161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16158121 - 2⁷ = 16157993 is a prime.

It is a super-2 number, since 2×16158121² = 522169748501282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16158521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50020 + ... + 50341.

It is an arithmetic number, because the mean of its divisors is an integer number (2408688).

Almost surely, 2^16158121 is an apocalyptic number.

It is an amenable number.

16158121 is a deficient number, since it is larger than the sum of its proper divisors (3111383).

16158121 is a wasteful number, since it uses less digits than its factorization.

16158121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100391.

The product of its digits is 480, while the sum is 25.

The square root of 16158121 is about 4019.7165322943. The cubic root of 16158121 is about 252.8115736787.

It can be divided in two parts, 161 and 58121, that multiplied together give a square (9357481 = 3059²).

The spelling of 16158121 in words is "sixteen million, one hundred fifty-eight thousand, one hundred twenty-one".