68922991 has 2 divisors, whose sum is σ = 68922992. Its totient is φ = 68922990.

The previous prime is 68922983. The next prime is 68923039. The reversal of 68922991 is 19922986.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68922991 - 2³ = 68922983 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68922901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34461495 + 34461496.

It is an arithmetic number, because the mean of its divisors is an integer number (34461496).

Almost surely, 2^68922991 is an apocalyptic number.

68922991 is a deficient number, since it is larger than the sum of its proper divisors (1).

68922991 is an equidigital number, since it uses as much as digits as its factorization.

68922991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 46.

The square root of 68922991 is about 8301.9871717559. The cubic root of 68922991 is about 410.0039480088.

The spelling of 68922991 in words is "sixty-eight million, nine hundred twenty-two thousand, nine hundred ninety-one".