1242494254581 has 4 divisors (see below), whose sum is σ = 1656659006112. Its totient is φ = 828329503052.

The previous prime is 1242494254579. The next prime is 1242494254633. The reversal of 1242494254581 is 1854524942421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1242494254581 - 2¹ = 1242494254579 is a prime.

It is a super-2 number, since 2×1242494254581² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242494254501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207082375761 + ... + 207082375766.

It is an arithmetic number, because the mean of its divisors is an integer number (414164751528).

Almost surely, 2^{1242494254581} is an apocalyptic number.

It is an amenable number.

1242494254581 is a deficient number, since it is larger than the sum of its proper divisors (414164751531).

1242494254581 is an equidigital number, since it uses as much as digits as its factorization.

1242494254581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414164751530.

The product of its digits is 3686400, while the sum is 51.

The spelling of 1242494254581 in words is "one trillion, two hundred forty-two billion, four hundred ninety-four million, two hundred fifty-four thousand, five hundred eighty-one".