1157436421 has 2 divisors, whose sum is σ = 1157436422. Its totient is φ = 1157436420.

The previous prime is 1157436409. The next prime is 1157436439. The reversal of 1157436421 is 1246347511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 632522500 + 524913921 = 25150^2 + 22911^2 .

It is a cyclic number.

It is not a de Polignac number, because 1157436421 - 2¹¹ = 1157434373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1157496421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578718210 + 578718211.

It is an arithmetic number, because the mean of its divisors is an integer number (578718211).

Almost surely, 2^1157436421 is an apocalyptic number.

It is an amenable number.

1157436421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1157436421 is an equidigital number, since it uses as much as digits as its factorization.

1157436421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 34.

The square root of 1157436421 is about 34021.1172803011. The cubic root of 1157436421 is about 1049.9429813331.

The spelling of 1157436421 in words is "one billion, one hundred fifty-seven million, four hundred thirty-six thousand, four hundred twenty-one".