1242875491 has 16 divisors (see below), whose sum is σ = 1546056288. Its totient is φ = 981619200.

The previous prime is 1242875437. The next prime is 1242875507. The reversal of 1242875491 is 1945782421.

It is a cyclic number.

It is not a de Polignac number, because 1242875491 - 2⁷ = 1242875363 is a prime.

It is a super-2 number, since 2×1242875491² = 3089478972256982162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242875401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253200 + ... + 258061.

It is an arithmetic number, because the mean of its divisors is an integer number (96628518).

Almost surely, 2^1242875491 is an apocalyptic number.

1242875491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1242875491 is a deficient number, since it is larger than the sum of its proper divisors (303180797).

1242875491 is a wasteful number, since it uses less digits than its factorization.

1242875491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511302.

The product of its digits is 161280, while the sum is 43.

The square root of 1242875491 is about 35254.4393091140. The cubic root of 1242875491 is about 1075.1668725266.

The spelling of 1242875491 in words is "one billion, two hundred forty-two million, eight hundred seventy-five thousand, four hundred ninety-one".