1156021057 has 2 divisors, whose sum is σ = 1156021058. Its totient is φ = 1156021056.

The previous prime is 1156021033. The next prime is 1156021079. The reversal of 1156021057 is 7501206511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1135959616 + 20061441 = 33704^2 + 4479^2 .

It is an emirp because it is prime and its reverse (7501206511) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1156021057 is a prime.

It is not a weakly prime, because it can be changed into another prime (1156021157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578010528 + 578010529.

It is an arithmetic number, because the mean of its divisors is an integer number (578010529).

Almost surely, 2^1156021057 is an apocalyptic number.

It is an amenable number.

1156021057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1156021057 is an equidigital number, since it uses as much as digits as its factorization.

1156021057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 1156021057 is about 34000.3096603546. The cubic root of 1156021057 is about 1049.5148346637.

Adding to 1156021057 its reverse (7501206511), we get a palindrome (8657227568).

The spelling of 1156021057 in words is "one billion, one hundred fifty-six million, twenty-one thousand, fifty-seven".