1136721557 has 8 divisors (see below), whose sum is σ = 1146067416. Its totient is φ = 1127411712.

The previous prime is 1136721539. The next prime is 1136721587. The reversal of 1136721557 is 7551276311.

It can be written as a sum of positive squares in 4 ways, for example, as 13734436 + 1122987121 = 3706^2 + 33511^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1136721557 - 2⁸ = 1136721301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1136721557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1136721527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56303 + ... + 73779.

It is an arithmetic number, because the mean of its divisors is an integer number (143258427).

Almost surely, 2^1136721557 is an apocalyptic number.

It is an amenable number.

1136721557 is a deficient number, since it is larger than the sum of its proper divisors (9345859).

1136721557 is a wasteful number, since it uses less digits than its factorization.

1136721557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18007.

The product of its digits is 44100, while the sum is 38.

The square root of 1136721557 is about 33715.3015261617. The cubic root of 1136721557 is about 1043.6415601924.

Adding to 1136721557 its reverse (7551276311), we get a palindrome (8687997868).

The spelling of 1136721557 in words is "one billion, one hundred thirty-six million, seven hundred twenty-one thousand, five hundred fifty-seven".