1267201745 has 4 divisors (see below), whose sum is σ = 1520642100. Its totient is φ = 1013761392.

The previous prime is 1267201717. The next prime is 1267201763. The reversal of 1267201745 is 5471027621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 211731601 + 1055470144 = 14551^2 + 32488^2 .

It is a cyclic number.

It is not a de Polignac number, because 1267201745 - 2¹² = 1267197649 is a prime.

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, 126720170 + ... + 126720179.

It is an arithmetic number, because the mean of its divisors is an integer number (380160525).

Almost surely, 2^1267201745 is an apocalyptic number.

It is an amenable number.

1267201745 is a deficient number, since it is larger than the sum of its proper divisors (253440355).

1267201745 is an equidigital number, since it uses as much as digits as its factorization.

1267201745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253440354.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 1267201745 is about 35597.7772480249. Note that the first 3 decimals coincide. The cubic root of 1267201745 is about 1082.1361883168.

The spelling of 1267201745 in words is "one billion, two hundred sixty-seven million, two hundred one thousand, seven hundred forty-five".