1531242661 has 8 divisors (see below), whose sum is σ = 1735821920. Its totient is φ = 1339062192.

The previous prime is 1531242631. The next prime is 1531242667. The reversal of 1531242661 is 1662421351.

It is a happy number.

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

It is not a de Polignac number, because 1531242661 - 2⁹ = 1531242149 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 (1531242667) 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, 3099435 + ... + 3099928.

It is an arithmetic number, because the mean of its divisors is an integer number (216977740).

Almost surely, 2^1531242661 is an apocalyptic number.

It is an amenable number.

1531242661 is a deficient number, since it is larger than the sum of its proper divisors (204579259).

1531242661 is a wasteful number, since it uses less digits than its factorization.

1531242661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6199395.

The product of its digits is 8640, while the sum is 31.

The square root of 1531242661 is about 39131.0958318317. The cubic root of 1531242661 is about 1152.6072315971.

The spelling of 1531242661 in words is "one billion, five hundred thirty-one million, two hundred forty-two thousand, six hundred sixty-one".