1137378821 has 4 divisors (see below), whose sum is σ = 1137450144. Its totient is φ = 1137307500.

The previous prime is 1137378799. The next prime is 1137378859. The reversal of 1137378821 is 1288737311.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1137378821 - 2¹⁰ = 1137377797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1137375821) 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, 446 + ... + 47696.

It is an arithmetic number, because the mean of its divisors is an integer number (284362536).

Almost surely, 2^1137378821 is an apocalyptic number.

It is an amenable number.

1137378821 is a deficient number, since it is larger than the sum of its proper divisors (71323).

1137378821 is an equidigital number, since it uses as much as digits as its factorization.

1137378821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71322.

The product of its digits is 56448, while the sum is 41.

The square root of 1137378821 is about 33725.0473832136. The cubic root of 1137378821 is about 1043.8426695017.

The spelling of 1137378821 in words is "one billion, one hundred thirty-seven million, three hundred seventy-eight thousand, eight hundred twenty-one".