1532115661 has 4 divisors (see below), whose sum is σ = 1533498300. Its totient is φ = 1530733024.

The previous prime is 1532115653. The next prime is 1532115691. The reversal of 1532115661 is 1665112351.

It is a happy number.

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 295186761 + 1236928900 = 17181^2 + 35170^2 .

It is a cyclic number.

It is not a de Polignac number, because 1532115661 - 2³ = 1532115653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1532115691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 689656 + ... + 691873.

It is an arithmetic number, because the mean of its divisors is an integer number (383374575).

Almost surely, 2^1532115661 is an apocalyptic number.

It is an amenable number.

1532115661 is a deficient number, since it is larger than the sum of its proper divisors (1382639).

1532115661 is a wasteful number, since it uses less digits than its factorization.

1532115661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1382638.

The product of its digits is 5400, while the sum is 31.

The square root of 1532115661 is about 39142.2490539315. The cubic root of 1532115661 is about 1152.8262334520.

The spelling of 1532115661 in words is "one billion, five hundred thirty-two million, one hundred fifteen thousand, six hundred sixty-one".