69898981 has 2 divisors, whose sum is σ = 69898982. Its totient is φ = 69898980.

The previous prime is 69898943. The next prime is 69898991. The reversal of 69898981 is 18989896.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39262756 + 30636225 = 6266^2 + 5535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69898981 is a prime.

It is a super-2 number, since 2×69898981² = 9771735089676722, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69898901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34949490 + 34949491.

It is an arithmetic number, because the mean of its divisors is an integer number (34949491).

Almost surely, 2^69898981 is an apocalyptic number.

It is an amenable number.

69898981 is a deficient number, since it is larger than the sum of its proper divisors (1).

69898981 is an equidigital number, since it uses as much as digits as its factorization.

69898981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2239488, while the sum is 58.

The square root of 69898981 is about 8360.5610457672. The cubic root of 69898981 is about 411.9301830513.

The spelling of 69898981 in words is "sixty-nine million, eight hundred ninety-eight thousand, nine hundred eighty-one".