1261440627 has 4 divisors (see below), whose sum is σ = 1681920840. Its totient is φ = 840960416.

The previous prime is 1261440619. The next prime is 1261440629. The reversal of 1261440627 is 7260441621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7260441621 = 3 ⋅2420147207.

It is a cyclic number.

It is not a de Polignac number, because 1261440627 - 2³ = 1261440619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1261440629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210240102 + ... + 210240107.

It is an arithmetic number, because the mean of its divisors is an integer number (420480210).

Almost surely, 2^1261440627 is an apocalyptic number.

1261440627 is a deficient number, since it is larger than the sum of its proper divisors (420480213).

1261440627 is an equidigital number, since it uses as much as digits as its factorization.

1261440627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420480212.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 1261440627 is about 35516.7654354954. The cubic root of 1261440627 is about 1080.4937805514.

It can be divided in two parts, 126 and 1440627, that added together give a triangular number (1440753 = T₁₆₉₇).

The spelling of 1261440627 in words is "one billion, two hundred sixty-one million, four hundred forty thousand, six hundred twenty-seven".