90149749 has 2 divisors, whose sum is σ = 90149750. Its totient is φ = 90149748.

The previous prime is 90149729. The next prime is 90149753. The reversal of 90149749 is 94794109.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70728100 + 19421649 = 8410^2 + 4407^2 .

It is a cyclic number.

It is not a de Polignac number, because 90149749 - 2¹⁹ = 89625461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90149729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45074874 + 45074875.

It is an arithmetic number, because the mean of its divisors is an integer number (45074875).

Almost surely, 2^90149749 is an apocalyptic number.

It is an amenable number.

90149749 is a deficient number, since it is larger than the sum of its proper divisors (1).

90149749 is an equidigital number, since it uses as much as digits as its factorization.

90149749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 90149749 is about 9494.7221654981. The cubic root of 90149749 is about 448.3888872562.

The spelling of 90149749 in words is "ninety million, one hundred forty-nine thousand, seven hundred forty-nine".