76991069 has 2 divisors, whose sum is σ = 76991070. Its totient is φ = 76991068.

The previous prime is 76991053. The next prime is 76991077. The reversal of 76991069 is 96019967.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71182969 + 5808100 = 8437^2 + 2410^2 .

It is a cyclic number.

It is not a de Polignac number, because 76991069 - 2⁴ = 76991053 is a prime.

It is a super-2 number, since 2×76991069² = 11855249411525522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76991009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38495534 + 38495535.

It is an arithmetic number, because the mean of its divisors is an integer number (38495535).

Almost surely, 2^76991069 is an apocalyptic number.

It is an amenable number.

76991069 is a deficient number, since it is larger than the sum of its proper divisors (1).

76991069 is an equidigital number, since it uses as much as digits as its factorization.

76991069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708, while the sum is 47.

The square root of 76991069 is about 8774.4554816809. The cubic root of 76991069 is about 425.4156376766.

The spelling of 76991069 in words is "seventy-six million, nine hundred ninety-one thousand, sixty-nine".