291102320920 has 64 divisors (see below), whose sum is σ = 667123452000. Its totient is φ = 114294512640.

The previous prime is 291102320891. The next prime is 291102320923. The reversal of 291102320920 is 29023201192.

It is a super-2 number, since 2×291102320920² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291102320923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 559806 + ... + 946354.

Almost surely, 2^291102320920 is an apocalyptic number.

291102320920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 291102320920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (333561726000).

291102320920 is an abundant number, since it is smaller than the sum of its proper divisors (376021131080).

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

291102320920 is a wasteful number, since it uses less digits than its factorization.

291102320920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386908 (or 386904 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The spelling of 291102320920 in words is "two hundred ninety-one billion, one hundred two million, three hundred twenty thousand, nine hundred twenty".