1916370181 has 4 divisors (see below), whose sum is σ = 2090585664. Its totient is φ = 1742154700.

The previous prime is 1916370167. The next prime is 1916370227. The reversal of 1916370181 is 1810736191.

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 1916370181 - 2⁵ = 1916370149 is a prime.

It is a super-2 number, since 2×1916370181² = 7344949341251945522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1916370181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1916380181) 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, 87107725 + ... + 87107746.

It is an arithmetic number, because the mean of its divisors is an integer number (522646416).

Almost surely, 2^1916370181 is an apocalyptic number.

1916370181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1916370181 is a deficient number, since it is larger than the sum of its proper divisors (174215483).

1916370181 is a wasteful number, since it uses less digits than its factorization.

1916370181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174215482.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 1916370181 is about 43776.3655526587. The cubic root of 1916370181 is about 1242.1092658098.

The spelling of 1916370181 in words is "one billion, nine hundred sixteen million, three hundred seventy thousand, one hundred eighty-one".