16109977 has 4 divisors (see below), whose sum is σ = 17349220. Its totient is φ = 14870736.

The previous prime is 16109953. The next prime is 16110001. The reversal of 16109977 is 77990161.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (16109953) and next prime (16110001).

It can be written as a sum of positive squares in 2 ways, for example, as 4145296 + 11964681 = 2036^2 + 3459^2 .

It is a cyclic number.

It is not a de Polignac number, because 16109977 - 2²³ = 7721369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16109077) 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, 619602 + ... + 619627.

It is an arithmetic number, because the mean of its divisors is an integer number (4337305).

Almost surely, 2^16109977 is an apocalyptic number.

It is an amenable number.

16109977 is a deficient number, since it is larger than the sum of its proper divisors (1239243).

16109977 is a wasteful number, since it uses less digits than its factorization.

16109977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239242.

The product of its (nonzero) digits is 23814, while the sum is 40.

The square root of 16109977 is about 4013.7235829090. The cubic root of 16109977 is about 252.5602352781.

The spelling of 16109977 in words is "sixteen million, one hundred nine thousand, nine hundred seventy-seven".