1611139321 has 27 divisors (see below), whose sum is σ = 1835792749. Its totient is φ = 1412892800.

The previous prime is 1611139319. The next prime is 1611139349. The reversal of 1611139321 is 1239311161.

The square root of 1611139321 is 40139.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 982132921 + 629006400 = 31339^2 + 25080^2 .

It is not a de Polignac number, because 1611139321 - 2¹ = 1611139319 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 1611139321.

It is not an unprimeable number, because it can be changed into a prime (1611139721) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 18102645 + ... + 18102733.

Almost surely, 2^1611139321 is an apocalyptic number.

1611139321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1611139321 is the 40139-th square number.

1611139321 is the 20070-th centered octagonal number.

It is an amenable number.

1611139321 is a deficient number, since it is larger than the sum of its proper divisors (224653428).

1611139321 is an frugal number, since it uses more digits than its factorization.

1611139321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 141 counting only the distinct ones).

The product of its digits is 972, while the sum is 28.

The cubic root of 1611139321 is about 1172.3151181706.

The spelling of 1611139321 in words is "one billion, six hundred eleven million, one hundred thirty-nine thousand, three hundred twenty-one".