42131657 has 2 divisors, whose sum is σ = 42131658. Its totient is φ = 42131656.

The previous prime is 42131623. The next prime is 42131669. The reversal of 42131657 is 75613124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42042256 + 89401 = 6484^2 + 299^2 .

It is a cyclic number.

It is not a de Polignac number, because 42131657 - 2¹⁶ = 42066121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42137657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21065828 + 21065829.

It is an arithmetic number, because the mean of its divisors is an integer number (21065829).

Almost surely, 2^42131657 is an apocalyptic number.

It is an amenable number.

42131657 is a deficient number, since it is larger than the sum of its proper divisors (1).

42131657 is an equidigital number, since it uses as much as digits as its factorization.

42131657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 29.

The square root of 42131657 is about 6490.8903087327. The cubic root of 42131657 is about 347.9654945530.

The spelling of 42131657 in words is "forty-two million, one hundred thirty-one thousand, six hundred fifty-seven".