901521 has 6 divisors (see below), whose sum is σ = 1302210. Its totient is φ = 601008.

The previous prime is 901517. The next prime is 901529. The reversal of 901521 is 125109.

It can be written as a sum of positive squares in only one way, i.e., 497025 + 404496 = 705^2 + 636^2 .

It is not a de Polignac number, because 901521 - 2² = 901517 is a prime.

It is a super-2 number, since 2×901521² = 1625480226882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 901494 and 901503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (901529) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50076 + ... + 50093.

It is an arithmetic number, because the mean of its divisors is an integer number (217035).

2⁹⁰¹⁵²¹ is an apocalyptic number.

It is an amenable number.

901521 is a deficient number, since it is larger than the sum of its proper divisors (400689).

901521 is a wasteful number, since it uses less digits than its factorization.

901521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100175 (or 100172 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 901521 is about 949.4845970315. The cubic root of 901521 is about 96.6032970854.

The spelling of 901521 in words is "nine hundred one thousand, five hundred twenty-one".