1242318591 has 24 divisors (see below), whose sum is σ = 1891069440. Its totient is φ = 783723600.

The previous prime is 1242318589. The next prime is 1242318601. The reversal of 1242318591 is 1958132421.

1242318591 is a `hidden beast` number, since 12 + 42 + 3 + 18 + 591 = 666.

It is not a de Polignac number, because 1242318591 - 2¹ = 1242318589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242318391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 165796 + ... + 173126.

It is an arithmetic number, because the mean of its divisors is an integer number (78794560).

Almost surely, 2^1242318591 is an apocalyptic number.

1242318591 is a deficient number, since it is larger than the sum of its proper divisors (648750849).

1242318591 is a wasteful number, since it uses less digits than its factorization.

1242318591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8347 (or 8344 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 1242318591 is about 35246.5401280750. The cubic root of 1242318591 is about 1075.0062638178.

The spelling of 1242318591 in words is "one billion, two hundred forty-two million, three hundred eighteen thousand, five hundred ninety-one".