131261550 has 96 divisors (see below), whose sum is σ = 374976000. Its totient is φ = 29765760.

The previous prime is 131261531. The next prime is 131261551. The reversal of 131261550 is 55162131.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 131261550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131261551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 156031 + ... + 156869.

It is an arithmetic number, because the mean of its divisors is an integer number (3906000).

Almost surely, 2^131261550 is an apocalyptic number.

131261550 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 131261550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187488000).

131261550 is an abundant number, since it is smaller than the sum of its proper divisors (243714450).

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

131261550 is a wasteful number, since it uses less digits than its factorization.

131261550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010 (or 1005 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 131261550 is about 11456.9433096267. The cubic root of 131261550 is about 508.2130851167.

The spelling of 131261550 in words is "one hundred thirty-one million, two hundred sixty-one thousand, five hundred fifty".