1255421551 has 2 divisors, whose sum is σ = 1255421552. Its totient is φ = 1255421550.

The previous prime is 1255421537. The next prime is 1255421569. The reversal of 1255421551 is 1551245521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1255421551 - 2⁹ = 1255421039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1255421521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627710775 + 627710776.

It is an arithmetic number, because the mean of its divisors is an integer number (627710776).

Almost surely, 2^1255421551 is an apocalyptic number.

1255421551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255421551 is an equidigital number, since it uses as much as digits as its factorization.

1255421551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10000, while the sum is 31.

The square root of 1255421551 is about 35431.9284120975. The cubic root of 1255421551 is about 1078.7724825161.

The spelling of 1255421551 in words is "one billion, two hundred fifty-five million, four hundred twenty-one thousand, five hundred fifty-one".