42691027 has 2 divisors, whose sum is σ = 42691028. Its totient is φ = 42691026.

The previous prime is 42691003. The next prime is 42691031. The reversal of 42691027 is 72019624.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42691027 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42691027.

It is not a weakly prime, because it can be changed into another prime (42694027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21345513 + 21345514.

It is an arithmetic number, because the mean of its divisors is an integer number (21345514).

Almost surely, 2^42691027 is an apocalyptic number.

42691027 is a deficient number, since it is larger than the sum of its proper divisors (1).

42691027 is an equidigital number, since it uses as much as digits as its factorization.

42691027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 42691027 is about 6533.8370809196. The cubic root of 42691027 is about 349.4986754650.

The spelling of 42691027 in words is "forty-two million, six hundred ninety-one thousand, twenty-seven".