1256145122 has 8 divisors (see below), whose sum is σ = 1884625500. Its totient is φ = 627936624.

The previous prime is 1256145101. The next prime is 1256145131. The reversal of 1256145122 is 2215416521.

It can be written as a sum of positive squares in 2 ways, for example, as 1236155281 + 19989841 = 35159^2 + 4471^2 .

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

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, 55997 + ... + 75152.

Almost surely, 2^1256145122 is an apocalyptic number.

1256145122 is a deficient number, since it is larger than the sum of its proper divisors (628480378).

1256145122 is a wasteful number, since it uses less digits than its factorization.

1256145122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135940.

The product of its digits is 4800, while the sum is 29.

The square root of 1256145122 is about 35442.1376612642. The cubic root of 1256145122 is about 1078.9796954025.

The spelling of 1256145122 in words is "one billion, two hundred fifty-six million, one hundred forty-five thousand, one hundred twenty-two".