131505091890 has 32 divisors (see below), whose sum is σ = 316932791040. Its totient is φ = 34921294464.

The previous prime is 131505091877. The next prime is 131505091969. The reversal of 131505091890 is 98190505131.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9163339 + ... + 9177678.

It is an arithmetic number, because the mean of its divisors is an integer number (9904149720).

Almost surely, 2^131505091890 is an apocalyptic number.

131505091890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

131505091890 is an abundant number, since it is smaller than the sum of its proper divisors (185427699150).

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

131505091890 is a wasteful number, since it uses less digits than its factorization.

131505091890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18341266.

The product of its (nonzero) digits is 48600, while the sum is 42.

The spelling of 131505091890 in words is "one hundred thirty-one billion, five hundred five million, ninety-one thousand, eight hundred ninety".