42158491 has 2 divisors, whose sum is σ = 42158492. Its totient is φ = 42158490.

The previous prime is 42158443. The next prime is 42158497. The reversal of 42158491 is 19485124.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42158491 - 2²¹ = 40061339 is a prime.

It is not a weakly prime, because it can be changed into another prime (42158497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21079245 + 21079246.

It is an arithmetic number, because the mean of its divisors is an integer number (21079246).

Almost surely, 2^42158491 is an apocalyptic number.

42158491 is a deficient number, since it is larger than the sum of its proper divisors (1).

42158491 is an equidigital number, since it uses as much as digits as its factorization.

42158491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 34.

The square root of 42158491 is about 6492.9570305062. The cubic root of 42158491 is about 348.0393529064.

The spelling of 42158491 in words is "forty-two million, one hundred fifty-eight thousand, four hundred ninety-one".