42451291 has 2 divisors, whose sum is σ = 42451292. Its totient is φ = 42451290.

The previous prime is 42451237. The next prime is 42451319. The reversal of 42451291 is 19215424.

42451291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (42451319) can be obtained adding 42451291 to its sum of digits (28).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42451291 - 2¹³ = 42443099 is a prime.

It is a super-2 number, since 2×42451291² = 3604224215133362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42251291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21225645 + 21225646.

It is an arithmetic number, because the mean of its divisors is an integer number (21225646).

Almost surely, 2^42451291 is an apocalyptic number.

42451291 is a deficient number, since it is larger than the sum of its proper divisors (1).

42451291 is an equidigital number, since it uses as much as digits as its factorization.

42451291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 28.

The square root of 42451291 is about 6515.4655244272. The cubic root of 42451291 is about 348.8432313702.

It can be divided in two parts, 424 and 51291, that added together give a palindrome (51715).

The spelling of 42451291 in words is "forty-two million, four hundred fifty-one thousand, two hundred ninety-one".