1100161621 has 8 divisors (see below), whose sum is σ = 1191337784. Its totient is φ = 1009920960.

The previous prime is 1100161609. The next prime is 1100161687. The reversal of 1100161621 is 1261610011.

It can be written as a sum of positive squares in 4 ways, for example, as 281400625 + 818760996 = 16775^2 + 28614^2 .

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 1100161621 - 2⁹ = 1100161109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100161421) 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, 231426 + ... + 236131.

It is an arithmetic number, because the mean of its divisors is an integer number (148917223).

Almost surely, 2^1100161621 is an apocalyptic number.

It is an amenable number.

1100161621 is a deficient number, since it is larger than the sum of its proper divisors (91176163).

1100161621 is a wasteful number, since it uses less digits than its factorization.

1100161621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467751.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 1100161621 is about 33168.6843423130. The cubic root of 1100161621 is about 1032.3306699940.

Adding to 1100161621 its reverse (1261610011), we get a palindrome (2361771632).

The spelling of 1100161621 in words is "one billion, one hundred million, one hundred sixty-one thousand, six hundred twenty-one".