69079981 has 2 divisors, whose sum is σ = 69079982. Its totient is φ = 69079980.

The previous prime is 69079963. The next prime is 69080047. The reversal of 69079981 is 18997096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62267881 + 6812100 = 7891^2 + 2610^2 .

It is a cyclic number.

It is not a de Polignac number, because 69079981 - 2¹³ = 69071789 is a prime.

It is a super-2 number, since 2×69079981² = 9544087549920722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69079081) 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, 34539990 + 34539991.

It is an arithmetic number, because the mean of its divisors is an integer number (34539991).

Almost surely, 2^69079981 is an apocalyptic number.

It is an amenable number.

69079981 is a deficient number, since it is larger than the sum of its proper divisors (1).

69079981 is an equidigital number, since it uses as much as digits as its factorization.

69079981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 69079981 is about 8311.4367590688. The cubic root of 69079981 is about 410.3150087551.

The spelling of 69079981 in words is "sixty-nine million, seventy-nine thousand, nine hundred eighty-one".