1145121557 has 2 divisors, whose sum is σ = 1145121558. Its totient is φ = 1145121556.

The previous prime is 1145121541. The next prime is 1145121559. The reversal of 1145121557 is 7551215411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 920151556 + 224970001 = 30334^2 + 14999^2 .

It is a cyclic number.

It is not a de Polignac number, because 1145121557 - 2⁴ = 1145121541 is a prime.

It is a super-2 number, since 2×1145121557² = 2622606760612208498, which contains 22 as substring.

Together with 1145121559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1145121559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572560778 + 572560779.

It is an arithmetic number, because the mean of its divisors is an integer number (572560779).

Almost surely, 2^1145121557 is an apocalyptic number.

It is an amenable number.

1145121557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1145121557 is an equidigital number, since it uses as much as digits as its factorization.

1145121557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7000, while the sum is 32.

The square root of 1145121557 is about 33839.6447528635. The cubic root of 1145121557 is about 1046.2059768973.

Adding to 1145121557 its reverse (7551215411), we get a palindrome (8696336968).

The spelling of 1145121557 in words is "one billion, one hundred forty-five million, one hundred twenty-one thousand, five hundred fifty-seven".