90847961 has 2 divisors, whose sum is σ = 90847962. Its totient is φ = 90847960.

The previous prime is 90847951. The next prime is 90847973. The reversal of 90847961 is 16974809.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49000000 + 41847961 = 7000^2 + 6469^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90847961 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (90847921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45423980 + 45423981.

It is an arithmetic number, because the mean of its divisors is an integer number (45423981).

Almost surely, 2^90847961 is an apocalyptic number.

It is an amenable number.

90847961 is a deficient number, since it is larger than the sum of its proper divisors (1).

90847961 is an equidigital number, since it uses as much as digits as its factorization.

90847961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 90847961 is about 9531.4196738996. The cubic root of 90847961 is about 449.5435057987.

The spelling of 90847961 in words is "ninety million, eight hundred forty-seven thousand, nine hundred sixty-one".