1256621116 has 12 divisors (see below), whose sum is σ = 2212579432. Its totient is φ = 624455568.

The previous prime is 1256621099. The next prime is 1256621153. The reversal of 1256621116 is 6111266521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 963015 + ... + 964318.

Almost surely, 2^1256621116 is an apocalyptic number.

It is an amenable number.

1256621116 is a deficient number, since it is larger than the sum of its proper divisors (955958316).

1256621116 is a wasteful number, since it uses less digits than its factorization.

1256621116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927500 (or 1927498 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The square root of 1256621116 is about 35448.8521111756. The cubic root of 1256621116 is about 1079.1159649556.

Adding to 1256621116 its reverse (6111266521), we get a palindrome (7367887637).

The spelling of 1256621116 in words is "one billion, two hundred fifty-six million, six hundred twenty-one thousand, one hundred sixteen".