913021 has 4 divisors (see below), whose sum is σ = 916252. Its totient is φ = 909792.

The previous prime is 913013. The next prime is 913027. The reversal of 913021 is 120319.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 476100 + 436921 = 690^2 + 661^2 .

It is a cyclic number.

It is not a de Polignac number, because 913021 - 2³ = 913013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 912986 and 913004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (913027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1146 + ... + 1771.

It is an arithmetic number, because the mean of its divisors is an integer number (229063).

2⁹¹³⁰²¹ is an apocalyptic number.

It is an amenable number.

913021 is a deficient number, since it is larger than the sum of its proper divisors (3231).

913021 is a wasteful number, since it uses less digits than its factorization.

913021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3230.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 913021 is about 955.5213236762. The cubic root of 913021 is about 97.0123270549.

It can be divided in two parts, 91 and 3021, that multiplied together give a triangular number (274911 = T₇₄₁).

The spelling of 913021 in words is "nine hundred thirteen thousand, twenty-one".