77690191 has 2 divisors, whose sum is σ = 77690192. Its totient is φ = 77690190.

The previous prime is 77690143. The next prime is 77690219. The reversal of 77690191 is 19109677.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77690191 - 2¹³ = 77681999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77690131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38845095 + 38845096.

It is an arithmetic number, because the mean of its divisors is an integer number (38845096).

Almost surely, 2^77690191 is an apocalyptic number.

77690191 is a deficient number, since it is larger than the sum of its proper divisors (1).

77690191 is an equidigital number, since it uses as much as digits as its factorization.

77690191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23814, while the sum is 40.

The square root of 77690191 is about 8814.2039345593. The cubic root of 77690191 is about 426.6994303318.

The spelling of 77690191 in words is "seventy-seven million, six hundred ninety thousand, one hundred ninety-one".