131847421 has 2 divisors, whose sum is σ = 131847422. Its totient is φ = 131847420.

The previous prime is 131847407. The next prime is 131847467. The reversal of 131847421 is 124748131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116402521 + 15444900 = 10789^2 + 3930^2 .

It is a cyclic number.

It is not a de Polignac number, because 131847421 - 2⁵ = 131847389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131847481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65923710 + 65923711.

It is an arithmetic number, because the mean of its divisors is an integer number (65923711).

Almost surely, 2^131847421 is an apocalyptic number.

It is an amenable number.

131847421 is a deficient number, since it is larger than the sum of its proper divisors (1).

131847421 is an equidigital number, since it uses as much as digits as its factorization.

131847421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 31.

The square root of 131847421 is about 11482.4832244598. The cubic root of 131847421 is about 508.9680800524.

The spelling of 131847421 in words is "one hundred thirty-one million, eight hundred forty-seven thousand, four hundred twenty-one".