90477181 has 2 divisors, whose sum is σ = 90477182. Its totient is φ = 90477180.

The previous prime is 90477151. The next prime is 90477241. The reversal of 90477181 is 18177409.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71554681 + 18922500 = 8459^2 + 4350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90477181 is a prime.

It is a super-4 number, since 4×90477181⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 90477181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90477131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45238590 + 45238591.

It is an arithmetic number, because the mean of its divisors is an integer number (45238591).

Almost surely, 2^90477181 is an apocalyptic number.

It is an amenable number.

90477181 is a deficient number, since it is larger than the sum of its proper divisors (1).

90477181 is an equidigital number, since it uses as much as digits as its factorization.

90477181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 90477181 is about 9511.9493795962. The cubic root of 90477181 is about 448.9310942650.

The spelling of 90477181 in words is "ninety million, four hundred seventy-seven thousand, one hundred eighty-one".