90845947 has 2 divisors, whose sum is σ = 90845948. Its totient is φ = 90845946.

The previous prime is 90845939. The next prime is 90845957. The reversal of 90845947 is 74954809.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90845947 - 2³ = 90845939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90845897 and 90845906.

It is not a weakly prime, because it can be changed into another prime (90845927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45422973 + 45422974.

It is an arithmetic number, because the mean of its divisors is an integer number (45422974).

Almost surely, 2^90845947 is an apocalyptic number.

90845947 is a deficient number, since it is larger than the sum of its proper divisors (1).

90845947 is an equidigital number, since it uses as much as digits as its factorization.

90845947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 90845947 is about 9531.3140227358. The cubic root of 90845947 is about 449.5401838115.

The spelling of 90845947 in words is "ninety million, eight hundred forty-five thousand, nine hundred forty-seven".