131561461 has 4 divisors (see below), whose sum is σ = 131609772. Its totient is φ = 131513152.

The previous prime is 131561407. The next prime is 131561501. The reversal of 131561461 is 164165131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6345361 + 125216100 = 2519^2 + 11190^2 .

It is a cyclic number.

It is not a de Polignac number, because 131561461 - 2¹³ = 131553269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131561161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19810 + ... + 25603.

It is an arithmetic number, because the mean of its divisors is an integer number (32902443).

Almost surely, 2^131561461 is an apocalyptic number.

It is an amenable number.

131561461 is a deficient number, since it is larger than the sum of its proper divisors (48311).

131561461 is an equidigital number, since it uses as much as digits as its factorization.

131561461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48310.

The product of its digits is 2160, while the sum is 28.

The square root of 131561461 is about 11470.0244550742. The cubic root of 131561461 is about 508.5998517361.

The spelling of 131561461 in words is "one hundred thirty-one million, five hundred sixty-one thousand, four hundred sixty-one".