1242641157 has 8 divisors (see below), whose sum is σ = 1657038240. Its totient is φ = 828335760.

The previous prime is 1242641149. The next prime is 1242641159. The reversal of 1242641157 is 7511462421.

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

It is not a de Polignac number, because 1242641157 - 2³ = 1242641149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242641159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20407 + ... + 53867.

It is an arithmetic number, because the mean of its divisors is an integer number (207129780).

Almost surely, 2^1242641157 is an apocalyptic number.

It is an amenable number.

1242641157 is a deficient number, since it is larger than the sum of its proper divisors (414397083).

1242641157 is a wasteful number, since it uses less digits than its factorization.

1242641157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45843.

The product of its digits is 13440, while the sum is 33.

The square root of 1242641157 is about 35251.1156844716. The cubic root of 1242641157 is about 1075.0992969752.

The spelling of 1242641157 in words is "one billion, two hundred forty-two million, six hundred forty-one thousand, one hundred fifty-seven".