1163213261 has 16 divisors (see below), whose sum is σ = 1353646080. Its totient is φ = 978889200.

The previous prime is 1163213257. The next prime is 1163213267. The reversal of 1163213261 is 1623123611.

It is a cyclic number.

It is not a de Polignac number, because 1163213261 - 2² = 1163213257 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 1163213261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1163213267) 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, 474140 + ... + 476586.

It is an arithmetic number, because the mean of its divisors is an integer number (84602880).

Almost surely, 2^1163213261 is an apocalyptic number.

It is an amenable number.

1163213261 is a deficient number, since it is larger than the sum of its proper divisors (190432819).

1163213261 is a wasteful number, since it uses less digits than its factorization.

1163213261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3664.

The product of its digits is 1296, while the sum is 26.

The square root of 1163213261 is about 34105.9124053294. The cubic root of 1163213261 is about 1051.6868610354.

Adding to 1163213261 its reverse (1623123611), we get a palindrome (2786336872).

The spelling of 1163213261 in words is "one billion, one hundred sixty-three million, two hundred thirteen thousand, two hundred sixty-one".