1165803421 has 2 divisors, whose sum is σ = 1165803422. Its totient is φ = 1165803420.

The previous prime is 1165803371. The next prime is 1165803427. The reversal of 1165803421 is 1243085611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 932630521 + 233172900 = 30539^2 + 15270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1165803421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1165803427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582901710 + 582901711.

It is an arithmetic number, because the mean of its divisors is an integer number (582901711).

Almost surely, 2^1165803421 is an apocalyptic number.

It is an amenable number.

1165803421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165803421 is an equidigital number, since it uses as much as digits as its factorization.

1165803421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 1165803421 is about 34143.8635921596. The cubic root of 1165803421 is about 1052.4668893506.

The spelling of 1165803421 in words is "one billion, one hundred sixty-five million, eight hundred three thousand, four hundred twenty-one".