1256226487 has 2 divisors, whose sum is σ = 1256226488. Its totient is φ = 1256226486.

The previous prime is 1256226463. The next prime is 1256226527. The reversal of 1256226487 is 7846226521.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1256226487 - 2¹⁹ = 1255702199 is a prime.

It is a super-2 number, since 2×1256226487² = 3156209973280722338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256226187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628113243 + 628113244.

It is an arithmetic number, because the mean of its divisors is an integer number (628113244).

Almost surely, 2^1256226487 is an apocalyptic number.

1256226487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256226487 is an equidigital number, since it uses as much as digits as its factorization.

1256226487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 43.

The square root of 1256226487 is about 35443.2854995132. The cubic root of 1256226487 is about 1079.0029913540.

The spelling of 1256226487 in words is "one billion, two hundred fifty-six million, two hundred twenty-six thousand, four hundred eighty-seven".