1138623557 has 2 divisors, whose sum is σ = 1138623558. Its totient is φ = 1138623556.

The previous prime is 1138623517. The next prime is 1138623571. The reversal of 1138623557 is 7553268311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1134746596 + 3876961 = 33686^2 + 1969^2 .

It is an emirp because it is prime and its reverse (7553268311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1138623557 - 2²⁸ = 870188101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1138623517) 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, 569311778 + 569311779.

It is an arithmetic number, because the mean of its divisors is an integer number (569311779).

Almost surely, 2^1138623557 is an apocalyptic number.

It is an amenable number.

1138623557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1138623557 is an equidigital number, since it uses as much as digits as its factorization.

1138623557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 41.

The square root of 1138623557 is about 33743.4965141433. The cubic root of 1138623557 is about 1044.2233209989.

It can be divided in two parts, 11386 and 23557, that added together give a palindrome (34943).

The spelling of 1138623557 in words is "one billion, one hundred thirty-eight million, six hundred twenty-three thousand, five hundred fifty-seven".