1242235681 has 8 divisors (see below), whose sum is σ = 1296599040. Its totient is φ = 1187901792.

The previous prime is 1242235649. The next prime is 1242235691. The reversal of 1242235681 is 1865322421.

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

It is not a de Polignac number, because 1242235681 - 2⁵ = 1242235649 is a prime.

It is a super-2 number, since 2×1242235681² = 3086298974299067522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242235691) 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, 158061 + ... + 165733.

It is an arithmetic number, because the mean of its divisors is an integer number (162074880).

Almost surely, 2^1242235681 is an apocalyptic number.

It is an amenable number.

1242235681 is a deficient number, since it is larger than the sum of its proper divisors (54363359).

1242235681 is an equidigital number, since it uses as much as digits as its factorization.

1242235681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14735.

The product of its digits is 23040, while the sum is 34.

The square root of 1242235681 is about 35245.3639646408. The cubic root of 1242235681 is about 1074.9823486555.

The spelling of 1242235681 in words is "one billion, two hundred forty-two million, two hundred thirty-five thousand, six hundred eighty-one".