76642091 has 2 divisors, whose sum is σ = 76642092. Its totient is φ = 76642090.

The previous prime is 76642063. The next prime is 76642109. The reversal of 76642091 is 19024667.

Together with next prime (76642109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 76642091 - 2²² = 72447787 is a prime.

It is a super-2 number, since 2×76642091² = 11748020225704562, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (76642021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38321045 + 38321046.

It is an arithmetic number, because the mean of its divisors is an integer number (38321046).

Almost surely, 2^76642091 is an apocalyptic number.

76642091 is a deficient number, since it is larger than the sum of its proper divisors (1).

76642091 is an equidigital number, since it uses as much as digits as its factorization.

76642091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 76642091 is about 8754.5468757669. The cubic root of 76642091 is about 424.7719025155.

The spelling of 76642091 in words is "seventy-six million, six hundred forty-two thousand, ninety-one".