1242351009 has 27 divisors (see below), whose sum is σ = 1859167089. Its totient is φ = 799401960.

The previous prime is 1242350987. The next prime is 1242351013. The reversal of 1242351009 is 9001532421.

The square root of 1242351009 is 35247.

It is a perfect power (a square), and thus also a powerful number.

1242351009 is a `hidden beast` number, since 124 + 23 + 510 + 0 + 9 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-1242351009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1242351059) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3277782 + ... + 3278160.

Almost surely, 2^1242351009 is an apocalyptic number.

1242351009 is the 35247-th square number.

1242351009 is the 17624-th centered octagonal number.

It is an amenable number.

1242351009 is a deficient number, since it is larger than the sum of its proper divisors (616816080).

1242351009 is an frugal number, since it uses more digits than its factorization.

1242351009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The cubic root of 1242351009 is about 1075.0156144117.

The spelling of 1242351009 in words is "one billion, two hundred forty-two million, three hundred fifty-one thousand, nine".