77199893 has 2 divisors, whose sum is σ = 77199894. Its totient is φ = 77199892.

The previous prime is 77199851. The next prime is 77199917. The reversal of 77199893 is 39899177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51868804 + 25331089 = 7202^2 + 5033^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77199893 is a prime.

It is a super-2 number, since 2×77199893² = 11919646958422898, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77199833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38599946 + 38599947.

It is an arithmetic number, because the mean of its divisors is an integer number (38599947).

Almost surely, 2^77199893 is an apocalyptic number.

77199893 is the 4697-th centered heptagonal number.

It is an amenable number.

77199893 is a deficient number, since it is larger than the sum of its proper divisors (1).

77199893 is an equidigital number, since it uses as much as digits as its factorization.

77199893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 53.

The square root of 77199893 is about 8786.3469656052. The cubic root of 77199893 is about 425.7999108099.

The spelling of 77199893 in words is "seventy-seven million, one hundred ninety-nine thousand, eight hundred ninety-three".