68991047 has 2 divisors, whose sum is σ = 68991048. Its totient is φ = 68991046.

The previous prime is 68991031. The next prime is 68991073. The reversal of 68991047 is 74019986.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68991047 - 2⁴ = 68991031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68990989 and 68991007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68991017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34495523 + 34495524.

It is an arithmetic number, because the mean of its divisors is an integer number (34495524).

Almost surely, 2^68991047 is an apocalyptic number.

68991047 is a deficient number, since it is larger than the sum of its proper divisors (1).

68991047 is an equidigital number, since it uses as much as digits as its factorization.

68991047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 68991047 is about 8306.0849381643. The cubic root of 68991047 is about 410.1388524349.

The spelling of 68991047 in words is "sixty-eight million, nine hundred ninety-one thousand, forty-seven".