1256516477 has 2 divisors, whose sum is σ = 1256516478. Its totient is φ = 1256516476.

The previous prime is 1256516453. The next prime is 1256516483. The reversal of 1256516477 is 7746156521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1220384356 + 36132121 = 34934^2 + 6011^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256516477 - 2⁶ = 1256516413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256516777) 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, 628258238 + 628258239.

It is an arithmetic number, because the mean of its divisors is an integer number (628258239).

Almost surely, 2^1256516477 is an apocalyptic number.

It is an amenable number.

1256516477 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256516477 is an equidigital number, since it uses as much as digits as its factorization.

1256516477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 352800, while the sum is 44.

The square root of 1256516477 is about 35447.3761652396. The cubic root of 1256516477 is about 1079.0860114164.

The spelling of 1256516477 in words is "one billion, two hundred fifty-six million, five hundred sixteen thousand, four hundred seventy-seven".