90999947 has 2 divisors, whose sum is σ = 90999948. Its totient is φ = 90999946.

The previous prime is 90999899. The next prime is 90999959. The reversal of 90999947 is 74999909.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90999947 - 2²⁰ = 89951371 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 90999892 and 90999901.

It is not a weakly prime, because it can be changed into another prime (90999977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45499973 + 45499974.

It is an arithmetic number, because the mean of its divisors is an integer number (45499974).

Almost surely, 2^90999947 is an apocalyptic number.

90999947 is a deficient number, since it is larger than the sum of its proper divisors (1).

90999947 is an equidigital number, since it uses as much as digits as its factorization.

90999947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1653372, while the sum is 56.

The square root of 90999947 is about 9539.3892362142. The cubic root of 90999947 is about 449.7940572049.

The spelling of 90999947 in words is "ninety million, nine hundred ninety-nine thousand, nine hundred forty-seven".