91077947 has 2 divisors, whose sum is σ = 91077948. Its totient is φ = 91077946.

The previous prime is 91077937. The next prime is 91077949. The reversal of 91077947 is 74977019.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91077947 - 2²⁴ = 74300731 is a prime.

Together with 91077949, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91077898 and 91077907.

It is not a weakly prime, because it can be changed into another prime (91077949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45538973 + 45538974.

It is an arithmetic number, because the mean of its divisors is an integer number (45538974).

Almost surely, 2^91077947 is an apocalyptic number.

91077947 is a deficient number, since it is larger than the sum of its proper divisors (1).

91077947 is an equidigital number, since it uses as much as digits as its factorization.

91077947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 111132, while the sum is 44.

The square root of 91077947 is about 9543.4766725759. The cubic root of 91077947 is about 449.9225331670.

The spelling of 91077947 in words is "ninety-one million, seventy-seven thousand, nine hundred forty-seven".