1151565421 has 2 divisors, whose sum is σ = 1151565422. Its totient is φ = 1151565420.

The previous prime is 1151565409. The next prime is 1151565427. The reversal of 1151565421 is 1245651511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1063412100 + 88153321 = 32610^2 + 9389^2 .

It is a cyclic number.

It is not a de Polignac number, because 1151565421 - 2⁷ = 1151565293 is a prime.

It is a super-2 number, since 2×1151565421² = 2652205837685814482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1151565427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 575782710 + 575782711.

It is an arithmetic number, because the mean of its divisors is an integer number (575782711).

Almost surely, 2^1151565421 is an apocalyptic number.

It is an amenable number.

1151565421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1151565421 is an equidigital number, since it uses as much as digits as its factorization.

1151565421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6000, while the sum is 31.

The square root of 1151565421 is about 33934.7229397854. The cubic root of 1151565421 is about 1048.1647217554.

The spelling of 1151565421 in words is "one billion, one hundred fifty-one million, five hundred sixty-five thousand, four hundred twenty-one".