42691951 has 2 divisors, whose sum is σ = 42691952. Its totient is φ = 42691950.

The previous prime is 42691919. The next prime is 42692011. The reversal of 42691951 is 15919624.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42691951 - 2⁵ = 42691919 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42691951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49691951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21345975 + 21345976.

It is an arithmetic number, because the mean of its divisors is an integer number (21345976).

Almost surely, 2^42691951 is an apocalyptic number.

42691951 is a deficient number, since it is larger than the sum of its proper divisors (1).

42691951 is an equidigital number, since it uses as much as digits as its factorization.

42691951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 37.

The square root of 42691951 is about 6533.9077893708. The cubic root of 42691951 is about 349.5011969507.

The spelling of 42691951 in words is "forty-two million, six hundred ninety-one thousand, nine hundred fifty-one".