1153997885 has 16 divisors (see below), whose sum is σ = 1419963696. Its totient is φ = 899977728.

The previous prime is 1153997881. The next prime is 1153997891. The reversal of 1153997885 is 5887993511.

It can be written as a sum of positive squares in 8 ways, for example, as 27321529 + 1126676356 = 5227^2 + 33566^2 .

It is a cyclic number.

It is not a de Polignac number, because 1153997885 - 2² = 1153997881 is a prime.

It is a super-2 number, since 2×1153997885² = 2663422237168946450, which contains 22 as substring.

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 1153997885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1153997881) 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, 27737 + ... + 55473.

It is an arithmetic number, because the mean of its divisors is an integer number (88747731).

It is a Poulet number, since it divides 2^1153997884-1.

Almost surely, 2^1153997885 is an apocalyptic number.

1153997885 is the 27737-th pentagonal number.

It is an amenable number.

1153997885 is a deficient number, since it is larger than the sum of its proper divisors (265965811).

1153997885 is a wasteful number, since it uses less digits than its factorization.

1153997885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27952.

The product of its digits is 2721600, while the sum is 56.

The square root of 1153997885 is about 33970.5443730300. The cubic root of 1153997885 is about 1048.9022192553.

The spelling of 1153997885 in words is "one billion, one hundred fifty-three million, nine hundred ninety-seven thousand, eight hundred eighty-five".