131920457 has 2 divisors, whose sum is σ = 131920458. Its totient is φ = 131920456.

The previous prime is 131920421. The next prime is 131920463. The reversal of 131920457 is 754029131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70627216 + 61293241 = 8404^2 + 7829^2 .

It is a cyclic number.

It is not a de Polignac number, because 131920457 - 2¹² = 131916361 is a prime.

It is not a weakly prime, because it can be changed into another prime (131920057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65960228 + 65960229.

It is an arithmetic number, because the mean of its divisors is an integer number (65960229).

Almost surely, 2^131920457 is an apocalyptic number.

It is an amenable number.

131920457 is a deficient number, since it is larger than the sum of its proper divisors (1).

131920457 is an equidigital number, since it uses as much as digits as its factorization.

131920457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 131920457 is about 11485.6631066735. The cubic root of 131920457 is about 509.0620425297.

Adding to 131920457 its reverse (754029131), we get a palindrome (885949588).

The spelling of 131920457 in words is "one hundred thirty-one million, nine hundred twenty thousand, four hundred fifty-seven".