1242517775 has 12 divisors (see below), whose sum is σ = 1545989592. Its totient is φ = 990615840.

The previous prime is 1242517739. The next prime is 1242517781. The reversal of 1242517775 is 5777152421.

It is not a de Polignac number, because 1242517775 - 2¹⁸ = 1242255631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77489 + ... + 92138.

It is an arithmetic number, because the mean of its divisors is an integer number (128832466).

Almost surely, 2^1242517775 is an apocalyptic number.

1242517775 is a deficient number, since it is larger than the sum of its proper divisors (303471817).

1242517775 is a wasteful number, since it uses less digits than its factorization.

1242517775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169930 (or 169925 counting only the distinct ones).

The product of its digits is 137200, while the sum is 41.

The square root of 1242517775 is about 35249.3655971281. The cubic root of 1242517775 is about 1075.0637135484.

The spelling of 1242517775 in words is "one billion, two hundred forty-two million, five hundred seventeen thousand, seven hundred seventy-five".