131287390 has 32 divisors (see below), whose sum is σ = 258824160. Its totient is φ = 47650944.

The previous prime is 131287369. The next prime is 131287391. The reversal of 131287390 is 93782131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131287391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 889 + ... + 16228.

It is an arithmetic number, because the mean of its divisors is an integer number (8088255).

Almost surely, 2^131287390 is an apocalyptic number.

131287390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

131287390 is a deficient number, since it is larger than the sum of its proper divisors (127536770).

131287390 is a wasteful number, since it uses less digits than its factorization.

131287390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17196.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 131287390 is about 11458.0709545717. The cubic root of 131287390 is about 508.2464316793.

The spelling of 131287390 in words is "one hundred thirty-one million, two hundred eighty-seven thousand, three hundred ninety".