90521641 has 8 divisors (see below), whose sum is σ = 103639680. Its totient is φ = 77450208.

The previous prime is 90521609. The next prime is 90521657. The reversal of 90521641 is 14612509.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90521641 - 2⁵ = 90521609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90521341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7381 + ... + 15346.

It is an arithmetic number, because the mean of its divisors is an integer number (12954960).

Almost surely, 2^90521641 is an apocalyptic number.

It is an amenable number.

90521641 is a deficient number, since it is larger than the sum of its proper divisors (13118039).

90521641 is a wasteful number, since it uses less digits than its factorization.

90521641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23303.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 90521641 is about 9514.2861529386. The cubic root of 90521641 is about 449.0046163318.

It can be divided in two parts, 90 and 521641, that added together give a triangular number (521731 = T₁₀₂₁).

The spelling of 90521641 in words is "ninety million, five hundred twenty-one thousand, six hundred forty-one".