1155639851 has 2 divisors, whose sum is σ = 1155639852. Its totient is φ = 1155639850.

The previous prime is 1155639841. The next prime is 1155639857. The reversal of 1155639851 is 1589365511.

It is a strong prime.

It is an emirp because it is prime and its reverse (1589365511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1155639851 - 2²⁶ = 1088530987 is a prime.

It is not a weakly prime, because it can be changed into another prime (1155639857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577819925 + 577819926.

It is an arithmetic number, because the mean of its divisors is an integer number (577819926).

Almost surely, 2^1155639851 is an apocalyptic number.

1155639851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155639851 is an equidigital number, since it uses as much as digits as its factorization.

1155639851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162000, while the sum is 44.

The square root of 1155639851 is about 33994.7032785992. The cubic root of 1155639851 is about 1049.3994603706.

The spelling of 1155639851 in words is "one billion, one hundred fifty-five million, six hundred thirty-nine thousand, eight hundred fifty-one".