1242484952857 has 4 divisors (see below), whose sum is σ = 1247319524916. Its totient is φ = 1237650380800.

The previous prime is 1242484952833. The next prime is 1242484952881. The reversal of 1242484952857 is 7582594842421.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1242484952833) and next prime (1242484952881).

It can be written as a sum of positive squares in 2 ways, for example, as 1128557776896 + 113927175961 = 1062336^2 + 337531^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242484952857 - 2⁷ = 1242484952729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1242484952795 and 1242484952804.

It is not an unprimeable number, because it can be changed into a prime (1242484952257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2417285644 + ... + 2417286157.

It is an arithmetic number, because the mean of its divisors is an integer number (311829881229).

Almost surely, 2^{1242484952857} is an apocalyptic number.

It is an amenable number.

1242484952857 is a deficient number, since it is larger than the sum of its proper divisors (4834572059).

1242484952857 is an equidigital number, since it uses as much as digits as its factorization.

1242484952857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4834572058.

The product of its digits is 51609600, while the sum is 61.

The spelling of 1242484952857 in words is "one trillion, two hundred forty-two billion, four hundred eighty-four million, nine hundred fifty-two thousand, eight hundred fifty-seven".