1241156251 has 4 divisors (see below), whose sum is σ = 1242927504. Its totient is φ = 1239385000.

The previous prime is 1241156243. The next prime is 1241156261. The reversal of 1241156251 is 1526511421.

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

It is a cyclic number.

It is not a de Polignac number, because 1241156251 - 2³ = 1241156243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1241156261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 884575 + ... + 885976.

It is an arithmetic number, because the mean of its divisors is an integer number (310731876).

Almost surely, 2^1241156251 is an apocalyptic number.

1241156251 is a deficient number, since it is larger than the sum of its proper divisors (1771253).

1241156251 is an equidigital number, since it uses as much as digits as its factorization.

1241156251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1771252.

The product of its digits is 2400, while the sum is 28.

The square root of 1241156251 is about 35230.0475588666. The cubic root of 1241156251 is about 1074.6708928736.

Adding to 1241156251 its reverse (1526511421), we get a palindrome (2767667672).

The spelling of 1241156251 in words is "one billion, two hundred forty-one million, one hundred fifty-six thousand, two hundred fifty-one".