1163531645 has 4 divisors (see below), whose sum is σ = 1396237980. Its totient is φ = 930825312.

The previous prime is 1163531641. The next prime is 1163531647. The reversal of 1163531645 is 5461353611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 822427684 + 341103961 = 28678^2 + 18469^2 .

It is a cyclic number.

It is not a de Polignac number, because 1163531645 - 2² = 1163531641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1163531641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116353160 + ... + 116353169.

It is an arithmetic number, because the mean of its divisors is an integer number (349059495).

Almost surely, 2^1163531645 is an apocalyptic number.

It is an amenable number.

1163531645 is a deficient number, since it is larger than the sum of its proper divisors (232706335).

1163531645 is an equidigital number, since it uses as much as digits as its factorization.

1163531645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232706334.

The product of its digits is 32400, while the sum is 35.

The square root of 1163531645 is about 34110.5796637935. The cubic root of 1163531645 is about 1051.7828049566.

The spelling of 1163531645 in words is "one billion, one hundred sixty-three million, five hundred thirty-one thousand, six hundred forty-five".