42051091 has 2 divisors, whose sum is σ = 42051092. Its totient is φ = 42051090.

The previous prime is 42051083. The next prime is 42051151. The reversal of 42051091 is 19015024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42051091 - 2³ = 42051083 is a prime.

It is not a weakly prime, because it can be changed into another prime (42051391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21025545 + 21025546.

It is an arithmetic number, because the mean of its divisors is an integer number (21025546).

Almost surely, 2^42051091 is an apocalyptic number.

42051091 is a deficient number, since it is larger than the sum of its proper divisors (1).

42051091 is an equidigital number, since it uses as much as digits as its factorization.

42051091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 42051091 is about 6484.6812566232. The cubic root of 42051091 is about 347.7435547383.

The spelling of 42051091 in words is "forty-two million, fifty-one thousand, ninety-one".