42131951 has 2 divisors, whose sum is σ = 42131952. Its totient is φ = 42131950.

The previous prime is 42131941. The next prime is 42131953. The reversal of 42131951 is 15913124.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42131951 is a prime.

Together with 42131953, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_2555108 and since 42131951 and 2555108 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42131951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42131953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21065975 + 21065976.

It is an arithmetic number, because the mean of its divisors is an integer number (21065976).

Almost surely, 2^42131951 is an apocalyptic number.

42131951 is a deficient number, since it is larger than the sum of its proper divisors (1).

42131951 is an equidigital number, since it uses as much as digits as its factorization.

42131951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 26.

The square root of 42131951 is about 6490.9129558175. The cubic root of 42131951 is about 347.9663039334.

The spelling of 42131951 in words is "forty-two million, one hundred thirty-one thousand, nine hundred fifty-one".