1271551 has 2 divisors, whose sum is σ = 1271552. Its totient is φ = 1271550.

The previous prime is 1271531. The next prime is 1271561. The reversal of 1271551 is 1551721.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1271551 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1271521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635775 + 635776.

It is an arithmetic number, because the mean of its divisors is an integer number (635776).

2^1271551 is an apocalyptic number.

1271551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271551 is an equidigital number, since it uses as much as digits as its factorization.

1271551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 350, while the sum is 22.

The square root of 1271551 is about 1127.6307019588. The cubic root of 1271551 is about 108.3372800666.

The spelling of 1271551 in words is "one million, two hundred seventy-one thousand, five hundred fifty-one".