78198611 has 2 divisors, whose sum is σ = 78198612. Its totient is φ = 78198610.

The previous prime is 78198607. The next prime is 78198667. The reversal of 78198611 is 11689187.

It is a weak prime.

It is an emirp because it is prime and its reverse (11689187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78198611 - 2² = 78198607 is a prime.

It is a super-2 number, since 2×78198611² = 12230045524658642, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78191611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39099305 + 39099306.

It is an arithmetic number, because the mean of its divisors is an integer number (39099306).

Almost surely, 2^78198611 is an apocalyptic number.

78198611 is a deficient number, since it is larger than the sum of its proper divisors (1).

78198611 is an equidigital number, since it uses as much as digits as its factorization.

78198611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 41.

The square root of 78198611 is about 8842.9978514076. The cubic root of 78198611 is about 427.6282090976.

The spelling of 78198611 in words is "seventy-eight million, one hundred ninety-eight thousand, six hundred eleven".