131561420 has 24 divisors (see below), whose sum is σ = 277830000. Its totient is φ = 52329152.

The previous prime is 131561407. The next prime is 131561501. The reversal of 131561420 is 24165131.

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 7 ways as a sum of consecutive naturals, for example, 14795 + ... + 21954.

It is an arithmetic number, because the mean of its divisors is an integer number (11576250).

Almost surely, 2^131561420 is an apocalyptic number.

131561420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131561420 is an abundant number, since it is smaller than the sum of its proper divisors (146268580).

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

131561420 is a wasteful number, since it uses less digits than its factorization.

131561420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36937 (or 36935 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 131561420 is about 11470.0226678067. The cubic root of 131561420 is about 508.5997989025.

The spelling of 131561420 in words is "one hundred thirty-one million, five hundred sixty-one thousand, four hundred twenty".