1242249553 has 4 divisors (see below), whose sum is σ = 1242501120. Its totient is φ = 1241997988.

The previous prime is 1242249523. The next prime is 1242249557. The reversal of 1242249553 is 3559422421.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3559422421 = 41 ⋅86815181.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242249553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242249557) 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 3 ways as a sum of consecutive naturals, for example, 118225 + ... + 128302.

It is an arithmetic number, because the mean of its divisors is an integer number (310625280).

Almost surely, 2^1242249553 is an apocalyptic number.

It is an amenable number.

1242249553 is a deficient number, since it is larger than the sum of its proper divisors (251567).

1242249553 is an equidigital number, since it uses as much as digits as its factorization.

1242249553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251566.

The product of its digits is 86400, while the sum is 37.

The square root of 1242249553 is about 35245.5607559307. The cubic root of 1242249553 is about 1074.9863500701.

The spelling of 1242249553 in words is "one billion, two hundred forty-two million, two hundred forty-nine thousand, five hundred fifty-three".