90525163891 has 2 divisors, whose sum is σ = 90525163892. Its totient is φ = 90525163890.

The previous prime is 90525163853. The next prime is 90525163913. The reversal of 90525163891 is 19836152509.

It is a strong prime.

It is an emirp because it is prime and its reverse (19836152509) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90525163891 is a prime.

It is not a weakly prime, because it can be changed into another prime (90525163291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45262581945 + 45262581946.

It is an arithmetic number, because the mean of its divisors is an integer number (45262581946).

Almost surely, 2^90525163891 is an apocalyptic number.

90525163891 is a deficient number, since it is larger than the sum of its proper divisors (1).

90525163891 is an equidigital number, since it uses as much as digits as its factorization.

90525163891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 583200, while the sum is 49.

The spelling of 90525163891 in words is "ninety billion, five hundred twenty-five million, one hundred sixty-three thousand, eight hundred ninety-one".