68902081 has 2 divisors, whose sum is σ = 68902082. Its totient is φ = 68902080.

The previous prime is 68902079. The next prime is 68902091. The reversal of 68902081 is 18020986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43349056 + 25553025 = 6584^2 + 5055^2 .

It is a cyclic number.

It is not a de Polignac number, because 68902081 - 2¹ = 68902079 is a prime.

It is a super-2 number, since 2×68902081² = 9494993532261122, which contains 22 as substring.

Together with 68902079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (68902091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34451040 + 34451041.

It is an arithmetic number, because the mean of its divisors is an integer number (34451041).

Almost surely, 2^68902081 is an apocalyptic number.

It is an amenable number.

68902081 is a deficient number, since it is larger than the sum of its proper divisors (1).

68902081 is an equidigital number, since it uses as much as digits as its factorization.

68902081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 68902081 is about 8300.7277391805. The cubic root of 68902081 is about 409.9624811989.

The spelling of 68902081 in words is "sixty-eight million, nine hundred two thousand, eighty-one".