90521019 has 12 divisors (see below), whose sum is σ = 131587456. Its totient is φ = 59962032.

The previous prime is 90521009. The next prime is 90521029. The reversal of 90521019 is 91012509.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (90521009) and next prime (90521029).

It is not a de Polignac number, because 90521019 - 2⁴ = 90521003 is a prime.

It is a super-2 number, since 2×90521019² = 16388109761596722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90520983 and 90521001.

It is not an unprimeable number, because it can be changed into a prime (90521009) 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 in 11 ways as a sum of consecutive naturals, for example, 30619 + ... + 33444.

Almost surely, 2^90521019 is an apocalyptic number.

90521019 is a deficient number, since it is larger than the sum of its proper divisors (41066437).

90521019 is a wasteful number, since it uses less digits than its factorization.

90521019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64226 (or 64223 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 90521019 is about 9514.2534651963. The cubic root of 90521019 is about 449.0035879165.

The spelling of 90521019 in words is "ninety million, five hundred twenty-one thousand, nineteen".