131261004 has 54 divisors (see below), whose sum is σ = 385975044. Its totient is φ = 37502640.

The previous prime is 131261003. The next prime is 131261021. The reversal of 131261004 is 400162131.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (131261003) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 35442 + ... + 38969.

It is an arithmetic number, because the mean of its divisors is an integer number (7147686).

Almost surely, 2^131261004 is an apocalyptic number.

131261004 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

131261004 is an abundant number, since it is smaller than the sum of its proper divisors (254714040).

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

131261004 is a wasteful number, since it uses less digits than its factorization.

131261004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74435 (or 74423 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 131261004 is about 11456.9194812567. The cubic root of 131261004 is about 508.2123804556.

The spelling of 131261004 in words is "one hundred thirty-one million, two hundred sixty-one thousand, four".