1147733821 has 16 divisors (see below), whose sum is σ = 1274823088. Its totient is φ = 1026432000.

The previous prime is 1147733819. The next prime is 1147733827. The reversal of 1147733821 is 1283377411.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 222904900 + 924828921 = 14930^2 + 30411^2 .

It is a cyclic number.

It is not a de Polignac number, because 1147733821 - 2¹ = 1147733819 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a deceptive number, since it divides R_1147733820.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1147733827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110971 + ... + 120871.

It is an arithmetic number, because the mean of its divisors is an integer number (79676443).

Almost surely, 2^1147733821 is an apocalyptic number.

It is an amenable number.

1147733821 is a deficient number, since it is larger than the sum of its proper divisors (127089267).

1147733821 is a wasteful number, since it uses less digits than its factorization.

1147733821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10192.

The product of its digits is 28224, while the sum is 37.

The square root of 1147733821 is about 33878.2204520840. The cubic root of 1147733821 is about 1047.0009116259. Note that the first 3 decimals are identical.

The spelling of 1147733821 in words is "one billion, one hundred forty-seven million, seven hundred thirty-three thousand, eight hundred twenty-one".