90861851 has 2 divisors, whose sum is σ = 90861852. Its totient is φ = 90861850.

The previous prime is 90861833. The next prime is 90861877. The reversal of 90861851 is 15816809.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90861851 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90861811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45430925 + 45430926.

It is an arithmetic number, because the mean of its divisors is an integer number (45430926).

Almost surely, 2^90861851 is an apocalyptic number.

90861851 is a deficient number, since it is larger than the sum of its proper divisors (1).

90861851 is an equidigital number, since it uses as much as digits as its factorization.

90861851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 90861851 is about 9532.1482888172. The cubic root of 90861851 is about 449.5664152878.

The spelling of 90861851 in words is "ninety million, eight hundred sixty-one thousand, eight hundred fifty-one".