1820190918291 has 16 divisors (see below), whose sum is σ = 2578462442400. Its totient is φ = 1139951812608.

The previous prime is 1820190918281. The next prime is 1820190918307. The reversal of 1820190918291 is 1928190910281.

It is a happy number.

It is not a de Polignac number, because 1820190918291 - 2³⁴ = 1803011049107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1820190918281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282722926 + ... + 282729363.

It is an arithmetic number, because the mean of its divisors is an integer number (161153902650).

Almost surely, 2^{1820190918291} is an apocalyptic number.

1820190918291 is a deficient number, since it is larger than the sum of its proper divisors (758271524109).

1820190918291 is a wasteful number, since it uses less digits than its factorization.

1820190918291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565452358.

The product of its (nonzero) digits is 186624, while the sum is 51.

The spelling of 1820190918291 in words is "one trillion, eight hundred twenty billion, one hundred ninety million, nine hundred eighteen thousand, two hundred ninety-one".