90881501 has 2 divisors, whose sum is σ = 90881502. Its totient is φ = 90881500.

The previous prime is 90881477. The next prime is 90881513. The reversal of 90881501 is 10518809.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53304601 + 37576900 = 7301^2 + 6130^2 .

It is a cyclic number.

It is not a de Polignac number, because 90881501 - 2¹⁸ = 90619357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_5265176 and since 90881501 and 5265176 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90884501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45440750 + 45440751.

It is an arithmetic number, because the mean of its divisors is an integer number (45440751).

Almost surely, 2^90881501 is an apocalyptic number.

It is an amenable number.

90881501 is a deficient number, since it is larger than the sum of its proper divisors (1).

90881501 is an equidigital number, since it uses as much as digits as its factorization.

90881501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 90881501 is about 9533.1789556265. The cubic root of 90881501 is about 449.5988210526.

The spelling of 90881501 in words is "ninety million, eight hundred eighty-one thousand, five hundred one".