90181541 has 2 divisors, whose sum is σ = 90181542. Its totient is φ = 90181540.

The previous prime is 90181529. The next prime is 90181577. The reversal of 90181541 is 14518109.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88924900 + 1256641 = 9430^2 + 1121^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90181541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90381541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45090770 + 45090771.

It is an arithmetic number, because the mean of its divisors is an integer number (45090771).

Almost surely, 2^90181541 is an apocalyptic number.

It is an amenable number.

90181541 is a deficient number, since it is larger than the sum of its proper divisors (1).

90181541 is an equidigital number, since it uses as much as digits as its factorization.

90181541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 90181541 is about 9496.3962111951. The cubic root of 90181541 is about 448.4415903207.

The spelling of 90181541 in words is "ninety million, one hundred eighty-one thousand, five hundred forty-one".