1161537540 has 24 divisors (see below), whose sum is σ = 3252305280. Its totient is φ = 309743328.

The previous prime is 1161537523. The next prime is 1161537541. The reversal of 1161537540 is 457351611.

It is not an unprimeable number, because it can be changed into a prime (1161537541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9679420 + ... + 9679539.

It is an arithmetic number, because the mean of its divisors is an integer number (135512720).

Almost surely, 2^1161537540 is an apocalyptic number.

1161537540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1161537540 is an abundant number, since it is smaller than the sum of its proper divisors (2090767740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1161537540 is a wasteful number, since it uses less digits than its factorization.

1161537540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19358971 (or 19358969 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 1161537540 is about 34081.3371216565. The cubic root of 1161537540 is about 1051.1815995137.

The spelling of 1161537540 in words is "one billion, one hundred sixty-one million, five hundred thirty-seven thousand, five hundred forty".