1161216749 has 48 divisors (see below), whose sum is σ = 1563624000. Its totient is φ = 850348800.

The previous prime is 1161216743. The next prime is 1161216781. The reversal of 1161216749 is 9476121611.

1161216749 = 4162² + 4163² + ... + 4227².

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1161216749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161216743) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1525529 + ... + 1526289.

It is an arithmetic number, because the mean of its divisors is an integer number (32575500).

Almost surely, 2^1161216749 is an apocalyptic number.

1161216749 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1161216749 is a deficient number, since it is larger than the sum of its proper divisors (402407251).

1161216749 is a wasteful number, since it uses less digits than its factorization.

1161216749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954 (or 947 counting only the distinct ones).

The product of its digits is 18144, while the sum is 38.

The square root of 1161216749 is about 34076.6305405919. The cubic root of 1161216749 is about 1051.0848195610.

The spelling of 1161216749 in words is "one billion, one hundred sixty-one million, two hundred sixteen thousand, seven hundred forty-nine".