90249947 has 2 divisors, whose sum is σ = 90249948. Its totient is φ = 90249946.

The previous prime is 90249941. The next prime is 90249949. The reversal of 90249947 is 74994209.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90249947 is a prime.

Together with 90249949, 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 = 90249898 and 90249907.

It is not a weakly prime, because it can be changed into another prime (90249941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45124973 + 45124974.

It is an arithmetic number, because the mean of its divisors is an integer number (45124974).

Almost surely, 2^90249947 is an apocalyptic number.

90249947 is a deficient number, since it is larger than the sum of its proper divisors (1).

90249947 is an equidigital number, since it uses as much as digits as its factorization.

90249947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 90249947 is about 9499.9972105259. The cubic root of 90249947 is about 448.5549481174.

The spelling of 90249947 in words is "ninety million, two hundred forty-nine thousand, nine hundred forty-seven".