1991141810 has 16 divisors (see below), whose sum is σ = 4096063296. Its totient is φ = 682677168.

The previous prime is 1991141807. The next prime is 1991141819. The reversal of 1991141810 is 181411991.

It is a super-2 number, since 2×1991141810² = 7929291415060152200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (1991141819) 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, 14222372 + ... + 14222511.

It is an arithmetic number, because the mean of its divisors is an integer number (256003956).

Almost surely, 2^1991141810 is an apocalyptic number.

1991141810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1991141810 is an abundant number, since it is smaller than the sum of its proper divisors (2104921486).

1991141810 is a wasteful number, since it uses less digits than its factorization.

1991141810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28444897.

The product of its (nonzero) digits is 2592, while the sum is 35.

The square root of 1991141810 is about 44622.2120697753. The cubic root of 1991141810 is about 1258.0581935853.

The spelling of 1991141810 in words is "one billion, nine hundred ninety-one million, one hundred forty-one thousand, eight hundred ten".