90381541 has 2 divisors, whose sum is σ = 90381542. Its totient is φ = 90381540.

The previous prime is 90381539. The next prime is 90381563. The reversal of 90381541 is 14518309.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52620516 + 37761025 = 7254^2 + 6145^2 .

It is a cyclic number.

It is not a de Polignac number, because 90381541 - 2¹ = 90381539 is a prime.

Together with 90381539, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90381521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45190770 + 45190771.

It is an arithmetic number, because the mean of its divisors is an integer number (45190771).

Almost surely, 2^90381541 is an apocalyptic number.

It is an amenable number.

90381541 is a deficient number, since it is larger than the sum of its proper divisors (1).

90381541 is an equidigital number, since it uses as much as digits as its factorization.

90381541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 90381541 is about 9506.9206896871. The cubic root of 90381541 is about 448.7728558125.

The spelling of 90381541 in words is "ninety million, three hundred eighty-one thousand, five hundred forty-one".