69491887 has 2 divisors, whose sum is σ = 69491888. Its totient is φ = 69491886.

The previous prime is 69491881. The next prime is 69491923. The reversal of 69491887 is 78819496.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69491887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69491881) 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, 34745943 + 34745944.

It is an arithmetic number, because the mean of its divisors is an integer number (34745944).

Almost surely, 2^69491887 is an apocalyptic number.

69491887 is a deficient number, since it is larger than the sum of its proper divisors (1).

69491887 is an equidigital number, since it uses as much as digits as its factorization.

69491887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 52.

The square root of 69491887 is about 8336.1794006607. The cubic root of 69491887 is about 411.1289271369.

It can be divided in two parts, 6949188 and 7, that multiplied together give a triangular number (48644316 = T₉₈₆₃).

The spelling of 69491887 in words is "sixty-nine million, four hundred ninety-one thousand, eight hundred eighty-seven".