1161923569 has 9 divisors (see below), whose sum is σ = 1178201803. Its totient is φ = 1145868592.

The previous prime is 1161923561. The next prime is 1161923573. The reversal of 1161923569 is 9653291611.

The square root of 1161923569 is 34087.

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

It can be written as a sum of positive squares in only one way, i.e., 223113969 + 938809600 = 14937^2 + 30640^2 .

It is not a de Polignac number, because 1161923569 - 2³ = 1161923561 is a prime.

It is a super-2 number, since 2×1161923569² = 2700132760395395522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161923561) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3033552 + ... + 3033934.

Almost surely, 2^1161923569 is an apocalyptic number.

1161923569 is the 34087-th square number.

1161923569 is the 17044-th centered octagonal number.

It is an amenable number.

1161923569 is a deficient number, since it is larger than the sum of its proper divisors (16278234).

1161923569 is an frugal number, since it uses more digits than its factorization.

1161923569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944 (or 472 counting only the distinct ones).

The product of its digits is 87480, while the sum is 43.

The cubic root of 1161923569 is about 1051.2980376033.

The spelling of 1161923569 in words is "one billion, one hundred sixty-one million, nine hundred twenty-three thousand, five hundred sixty-nine".