1115661521 has 8 divisors (see below), whose sum is σ = 1202281920. Its totient is φ = 1029155472.

The previous prime is 1115661497. The next prime is 1115661527. The reversal of 1115661521 is 1251665111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1115661521 - 2³⁰ = 41919697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1115661527) 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, 7751 + ... + 47868.

It is an arithmetic number, because the mean of its divisors is an integer number (150285240).

Almost surely, 2^1115661521 is an apocalyptic number.

It is an amenable number.

1115661521 is a deficient number, since it is larger than the sum of its proper divisors (86620399).

1115661521 is a wasteful number, since it uses less digits than its factorization.

1115661521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57175.

The product of its digits is 1800, while the sum is 29.

The square root of 1115661521 is about 33401.5197408741. The cubic root of 1115661521 is about 1037.1561610109.

The spelling of 1115661521 in words is "one billion, one hundred fifteen million, six hundred sixty-one thousand, five hundred twenty-one".