90443961 has 12 divisors (see below), whose sum is σ = 138326292. Its totient is φ = 56749056.

The previous prime is 90443897. The next prime is 90443963. The reversal of 90443961 is 16934409.

It can be written as a sum of positive squares in 2 ways, for example, as 44475561 + 45968400 = 6669^2 + 6780^2 .

It is not a de Polignac number, because 90443961 - 2⁶ = 90443897 is a prime.

It is a super-2 number, since 2×90443961² = 16360220162739042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90443963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 295416 + ... + 295721.

It is an arithmetic number, because the mean of its divisors is an integer number (11527191).

Almost surely, 2^90443961 is an apocalyptic number.

It is an amenable number.

90443961 is a deficient number, since it is larger than the sum of its proper divisors (47882331).

90443961 is a wasteful number, since it uses less digits than its factorization.

90443961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591160 (or 591157 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 90443961 is about 9510.2029946789. The cubic root of 90443961 is about 448.8761437004.

The spelling of 90443961 in words is "ninety million, four hundred forty-three thousand, nine hundred sixty-one".