1136723521 has 4 divisors (see below), whose sum is σ = 1136926000. Its totient is φ = 1136521044.

The previous prime is 1136723519. The next prime is 1136723537. The reversal of 1136723521 is 1253276311.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1253276311 = 7 ⋅179039473.

It is a cyclic number.

It is not a de Polignac number, because 1136723521 - 2¹ = 1136723519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1136723501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92571 + ... + 104128.

It is an arithmetic number, because the mean of its divisors is an integer number (284231500).

Almost surely, 2^1136723521 is an apocalyptic number.

It is an amenable number.

1136723521 is a deficient number, since it is larger than the sum of its proper divisors (202479).

1136723521 is an equidigital number, since it uses as much as digits as its factorization.

1136723521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202478.

The product of its digits is 7560, while the sum is 31.

The square root of 1136723521 is about 33715.3306523902. The cubic root of 1136723521 is about 1043.6421612516.

Adding to 1136723521 its reverse (1253276311), we get a palindrome (2389999832).

The spelling of 1136723521 in words is "one billion, one hundred thirty-six million, seven hundred twenty-three thousand, five hundred twenty-one".