1256241261 has 8 divisors (see below), whose sum is σ = 1827260064. Its totient is φ = 761358320.

The previous prime is 1256241253. The next prime is 1256241263. The reversal of 1256241261 is 1621426521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1256241261 - 2³ = 1256241253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256241263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19033926 + ... + 19033991.

It is an arithmetic number, because the mean of its divisors is an integer number (228407508).

Almost surely, 2^1256241261 is an apocalyptic number.

1256241261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1256241261 is a deficient number, since it is larger than the sum of its proper divisors (571018803).

1256241261 is a wasteful number, since it uses less digits than its factorization.

1256241261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38067931.

The product of its digits is 5760, while the sum is 30.

The square root of 1256241261 is about 35443.4939163734. The cubic root of 1256241261 is about 1079.0072212515.

Adding to 1256241261 its reverse (1621426521), we get a palindrome (2877667782).

The spelling of 1256241261 in words is "one billion, two hundred fifty-six million, two hundred forty-one thousand, two hundred sixty-one".