131920425 has 144 divisors (see below), whose sum is σ = 308730240. Its totient is φ = 52254720.

The previous prime is 131920421. The next prime is 131920457. The reversal of 131920425 is 524029131.

It is not a de Polignac number, because 131920425 - 2² = 131920421 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131920421) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 347886 + ... + 348264.

It is an arithmetic number, because the mean of its divisors is an integer number (2143960).

Almost surely, 2^131920425 is an apocalyptic number.

131920425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131920425 is an abundant number, since it is smaller than the sum of its proper divisors (176809815).

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

131920425 is a wasteful number, since it uses less digits than its factorization.

131920425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432 (or 424 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 131920425 is about 11485.6617136323. The cubic root of 131920425 is about 509.0620013686.

Adding to 131920425 its reverse (524029131), we get a palindrome (655949556).

The spelling of 131920425 in words is "one hundred thirty-one million, nine hundred twenty thousand, four hundred twenty-five".