1241553251 has 4 divisors (see below), whose sum is σ = 1241664600. Its totient is φ = 1241441904.

The previous prime is 1241553223. The next prime is 1241553263. The reversal of 1241553251 is 1523551421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1523551421 = 7 ⋅217650203.

It is a cyclic number.

It is not a de Polignac number, because 1241553251 - 2¹⁰ = 1241552227 is a prime.

It is a super-3 number, since 3×1241553251³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1241553221) 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 3 ways as a sum of consecutive naturals, for example, 36821 + ... + 61958.

It is an arithmetic number, because the mean of its divisors is an integer number (310416150).

Almost surely, 2^1241553251 is an apocalyptic number.

1241553251 is a deficient number, since it is larger than the sum of its proper divisors (111349).

1241553251 is an equidigital number, since it uses as much as digits as its factorization.

1241553251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111348.

The product of its digits is 6000, while the sum is 29.

The square root of 1241553251 is about 35235.6815032717. The cubic root of 1241553251 is about 1074.7854631551.

The spelling of 1241553251 in words is "one billion, two hundred forty-one million, five hundred fifty-three thousand, two hundred fifty-one".