90547429981 has 2 divisors, whose sum is σ = 90547429982. Its totient is φ = 90547429980.

The previous prime is 90547429967. The next prime is 90547429991. The reversal of 90547429981 is 18992474509.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80718492100 + 9828937881 = 284110^2 + 99141^2 .

It is an emirp because it is prime and its reverse (18992474509) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90547429981 - 2⁷ = 90547429853 is a prime.

It is a super-2 number, since 2×90547429981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90547429991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45273714990 + 45273714991.

It is an arithmetic number, because the mean of its divisors is an integer number (45273714991).

Almost surely, 2^90547429981 is an apocalyptic number.

It is an amenable number.

90547429981 is a deficient number, since it is larger than the sum of its proper divisors (1).

90547429981 is an equidigital number, since it uses as much as digits as its factorization.

90547429981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6531840, while the sum is 58.

The spelling of 90547429981 in words is "ninety billion, five hundred forty-seven million, four hundred twenty-nine thousand, nine hundred eighty-one".