42551291 has 2 divisors, whose sum is σ = 42551292. Its totient is φ = 42551290.

The previous prime is 42551287. The next prime is 42551293. The reversal of 42551291 is 19215524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42551291 - 2² = 42551287 is a prime.

It is a super-2 number, since 2×42551291² = 3621224731533362, which contains 22 as substring.

Together with 42551293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42551293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21275645 + 21275646.

It is an arithmetic number, because the mean of its divisors is an integer number (21275646).

Almost surely, 2^42551291 is an apocalyptic number.

42551291 is a deficient number, since it is larger than the sum of its proper divisors (1).

42551291 is an equidigital number, since it uses as much as digits as its factorization.

42551291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 29.

The square root of 42551291 is about 6523.1350591568. The cubic root of 42551291 is about 349.1169330367.

The spelling of 42551291 in words is "forty-two million, five hundred fifty-one thousand, two hundred ninety-one".