1275720427 has 2 divisors, whose sum is σ = 1275720428. Its totient is φ = 1275720426.

The previous prime is 1275720419. The next prime is 1275720437. The reversal of 1275720427 is 7240275721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1275720427 - 2³ = 1275720419 is a prime.

It is not a weakly prime, because it can be changed into another prime (1275720437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637860213 + 637860214.

It is an arithmetic number, because the mean of its divisors is an integer number (637860214).

Almost surely, 2^1275720427 is an apocalyptic number.

1275720427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275720427 is an equidigital number, since it uses as much as digits as its factorization.

1275720427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54880, while the sum is 37.

The square root of 1275720427 is about 35717.2287138854. The cubic root of 1275720427 is about 1084.5556384335. Note that the first 3 decimals are identical.

The spelling of 1275720427 in words is "one billion, two hundred seventy-five million, seven hundred twenty thousand, four hundred twenty-seven".