1157123381 has 2 divisors, whose sum is σ = 1157123382. Its totient is φ = 1157123380.

The previous prime is 1157123339. The next prime is 1157123413. The reversal of 1157123381 is 1833217511.

It is an a-pointer prime, because the next prime (1157123413) can be obtained adding 1157123381 to its sum of digits (32).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1137982756 + 19140625 = 33734^2 + 4375^2 .

It is an emirp because it is prime and its reverse (1833217511) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1157123381 is a prime.

It is a super-2 number, since 2×1157123381² = 2677869037713742322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1157123881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578561690 + 578561691.

It is an arithmetic number, because the mean of its divisors is an integer number (578561691).

Almost surely, 2^1157123381 is an apocalyptic number.

It is an amenable number.

1157123381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1157123381 is an equidigital number, since it uses as much as digits as its factorization.

1157123381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 32.

The square root of 1157123381 is about 34016.5162972342. The cubic root of 1157123381 is about 1049.8483170156.

The spelling of 1157123381 in words is "one billion, one hundred fifty-seven million, one hundred twenty-three thousand, three hundred eighty-one".