77099969 has 2 divisors, whose sum is σ = 77099970. Its totient is φ = 77099968.

The previous prime is 77099959. The next prime is 77099977. The reversal of 77099969 is 96999077.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45064369 + 32035600 = 6713^2 + 5660^2 .

It is a cyclic number.

It is not a de Polignac number, because 77099969 - 2⁸ = 77099713 is a prime.

It is a super-2 number, since 2×77099969² = 11888810439601922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77099959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38549984 + 38549985.

It is an arithmetic number, because the mean of its divisors is an integer number (38549985).

Almost surely, 2^77099969 is an apocalyptic number.

It is an amenable number.

77099969 is a deficient number, since it is larger than the sum of its proper divisors (1).

77099969 is an equidigital number, since it uses as much as digits as its factorization.

77099969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1928934, while the sum is 56.

The square root of 77099969 is about 8780.6588021629. The cubic root of 77099969 is about 425.6161195330.

The spelling of 77099969 in words is "seventy-seven million, ninety-nine thousand, nine hundred sixty-nine".