1261501427 has 2 divisors, whose sum is σ = 1261501428. Its totient is φ = 1261501426.

The previous prime is 1261501349. The next prime is 1261501433. The reversal of 1261501427 is 7241051621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1261501427 - 2²² = 1257307123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1261501427.

It is not a weakly prime, because it can be changed into another prime (1261501457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630750713 + 630750714.

It is an arithmetic number, because the mean of its divisors is an integer number (630750714).

Almost surely, 2^1261501427 is an apocalyptic number.

1261501427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261501427 is an equidigital number, since it uses as much as digits as its factorization.

1261501427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 1261501427 is about 35517.6213589818. The cubic root of 1261501427 is about 1080.5111397952.

The spelling of 1261501427 in words is "one billion, two hundred sixty-one million, five hundred one thousand, four hundred twenty-seven".