1256604061 has 2 divisors, whose sum is σ = 1256604062. Its totient is φ = 1256604060.

The previous prime is 1256604053. The next prime is 1256604071. The reversal of 1256604061 is 1604066521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1256348025 + 256036 = 35445^2 + 506^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256604061 - 2³ = 1256604053 is a prime.

It is a super-2 number, since 2×1256604061² = 3158107532243383442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256604071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628302030 + 628302031.

It is an arithmetic number, because the mean of its divisors is an integer number (628302031).

Almost surely, 2^1256604061 is an apocalyptic number.

It is an amenable number.

1256604061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256604061 is an equidigital number, since it uses as much as digits as its factorization.

1256604061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1256604061 is about 35448.6115524995. The cubic root of 1256604061 is about 1079.1110829733. Note that the first 3 decimals are identical.

The spelling of 1256604061 in words is "one billion, two hundred fifty-six million, six hundred four thousand, sixty-one".