1256877461 has 4 divisors (see below), whose sum is σ = 1436431392. Its totient is φ = 1077323532.

The previous prime is 1256877451. The next prime is 1256877463. The reversal of 1256877461 is 1647786521.

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.

It is a cyclic number.

It is not a de Polignac number, because 1256877461 - 2¹⁰ = 1256876437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256877463) 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, 89776955 + ... + 89776968.

It is an arithmetic number, because the mean of its divisors is an integer number (359107848).

Almost surely, 2^1256877461 is an apocalyptic number.

It is an amenable number.

1256877461 is a deficient number, since it is larger than the sum of its proper divisors (179553931).

1256877461 is an equidigital number, since it uses as much as digits as its factorization.

1256877461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179553930.

The product of its digits is 564480, while the sum is 47.

The square root of 1256877461 is about 35452.4676292074. The cubic root of 1256877461 is about 1079.1893382184.

The spelling of 1256877461 in words is "one billion, two hundred fifty-six million, eight hundred seventy-seven thousand, four hundred sixty-one".