1261501241 has 32 divisors (see below), whose sum is σ = 1696800000. Its totient is φ = 905748480.

The previous prime is 1261501237. The next prime is 1261501249. The reversal of 1261501241 is 1421051621.

It is not a de Polignac number, because 1261501241 - 2² = 1261501237 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1261501249) 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 31 ways as a sum of consecutive naturals, for example, 1009385 + ... + 1010633.

It is an arithmetic number, because the mean of its divisors is an integer number (53025000).

Almost surely, 2^1261501241 is an apocalyptic number.

1261501241 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1261501241 is a deficient number, since it is larger than the sum of its proper divisors (435298759).

1261501241 is a wasteful number, since it uses less digits than its factorization.

1261501241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2289.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 1261501241 is about 35517.6187405631. The cubic root of 1261501241 is about 1080.5110866905.

Adding to 1261501241 its reverse (1421051621), we get a palindrome (2682552862).

The spelling of 1261501241 in words is "one billion, two hundred sixty-one million, five hundred one thousand, two hundred forty-one".