69891427 has 2 divisors, whose sum is σ = 69891428. Its totient is φ = 69891426.

The previous prime is 69891413. The next prime is 69891431. The reversal of 69891427 is 72419896.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 69891427 - 2¹⁹ = 69367139 is a prime.

It is not a weakly prime, because it can be changed into another prime (69891527) 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, 34945713 + 34945714.

It is an arithmetic number, because the mean of its divisors is an integer number (34945714).

Almost surely, 2^69891427 is an apocalyptic number.

69891427 is a deficient number, since it is larger than the sum of its proper divisors (1).

69891427 is an equidigital number, since it uses as much as digits as its factorization.

69891427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 46.

The square root of 69891427 is about 8360.1092696208. The cubic root of 69891427 is about 411.9153433848.

The spelling of 69891427 in words is "sixty-nine million, eight hundred ninety-one thousand, four hundred twenty-seven".