1165421 has 2 divisors, whose sum is σ = 1165422. Its totient is φ = 1165420.

The previous prime is 1165399. The next prime is 1165447. The reversal of 1165421 is 1245611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 792100 + 373321 = 890^2 + 611^2 .

It is a cyclic number.

It is not a de Polignac number, because 1165421 - 2⁶ = 1165357 is a prime.

It is a super-2 number, since 2×1165421² = 2716412214482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1165393 and 1165402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1165471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582710 + 582711.

It is an arithmetic number, because the mean of its divisors is an integer number (582711).

2^1165421 is an apocalyptic number.

It is an amenable number.

1165421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165421 is an equidigital number, since it uses as much as digits as its factorization.

1165421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 240, while the sum is 20.

The square root of 1165421 is about 1079.5466641142. The cubic root of 1165421 is about 105.2351795773.

The spelling of 1165421 in words is "one million, one hundred sixty-five thousand, four hundred twenty-one".