131515650 has 120 divisors (see below), whose sum is σ = 417711360. Its totient is φ = 30054240.

The previous prime is 131515639. The next prime is 131515691. The reversal of 131515650 is 56515131.

131515650 is a `hidden beast` number, since 1 + 3 + 1 + 5 + 1 + 5 + 650 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 26031 + ... + 30669.

It is an arithmetic number, because the mean of its divisors is an integer number (3480928).

Almost surely, 2^131515650 is an apocalyptic number.

131515650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 131515650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208855680).

131515650 is an abundant number, since it is smaller than the sum of its proper divisors (286195710).

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

131515650 is a wasteful number, since it uses less digits than its factorization.

131515650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4670 (or 4656 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The square root of 131515650 is about 11468.0272933055. The cubic root of 131515650 is about 508.5408117191.

The spelling of 131515650 in words is "one hundred thirty-one million, five hundred fifteen thousand, six hundred fifty".