69990881 has 2 divisors, whose sum is σ = 69990882. Its totient is φ = 69990880.

The previous prime is 69990857. The next prime is 69990913. The reversal of 69990881 is 18809996.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58369600 + 11621281 = 7640^2 + 3409^2 .

It is a cyclic number.

It is not a de Polignac number, because 69990881 - 2¹⁴ = 69974497 is a prime.

It is a super-2 number, since 2×69990881² = 9797446846312322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (69990181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34995440 + 34995441.

It is an arithmetic number, because the mean of its divisors is an integer number (34995441).

Almost surely, 2^69990881 is an apocalyptic number.

It is an amenable number.

69990881 is a deficient number, since it is larger than the sum of its proper divisors (1).

69990881 is an equidigital number, since it uses as much as digits as its factorization.

69990881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 50.

The square root of 69990881 is about 8366.0552831068. The cubic root of 69990881 is about 412.1106330129.

The spelling of 69990881 in words is "sixty-nine million, nine hundred ninety thousand, eight hundred eighty-one".