1881161415 has 144 divisors (see below), whose sum is σ = 4017581568. Its totient is φ = 827148672.

The previous prime is 1881161407. The next prime is 1881161419. The reversal of 1881161415 is 5141611881.

1881161415 is a `hidden beast` number, since 1 + 8 + 81 + 161 + 415 = 666.

It is not a de Polignac number, because 1881161415 - 2³ = 1881161407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1881161415.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881161419) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 7152574 + ... + 7152836.

It is an arithmetic number, because the mean of its divisors is an integer number (27899872).

Almost surely, 2^1881161415 is an apocalyptic number.

1881161415 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1881161415 is an abundant number, since it is smaller than the sum of its proper divisors (2136420153).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1881161415 is an equidigital number, since it uses as much as digits as its factorization.

1881161415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 307 counting only the distinct ones).

The product of its digits is 7680, while the sum is 36.

The square root of 1881161415 is about 43372.3577293188. The cubic root of 1881161415 is about 1234.4552586730.

The spelling of 1881161415 in words is "one billion, eight hundred eighty-one million, one hundred sixty-one thousand, four hundred fifteen".