1256038061 has 2 divisors, whose sum is σ = 1256038062. Its totient is φ = 1256038060.

The previous prime is 1256038031. The next prime is 1256038093. The reversal of 1256038061 is 1608306521.

It is a happy number.

It is an a-pointer prime, because the next prime (1256038093) can be obtained adding 1256038061 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 655052836 + 600985225 = 25594^2 + 24515^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256038061 - 2²² = 1251843757 is a prime.

It is a super-2 number, since 2×1256038061² = 3155263221361279442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256038031) 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, 628019030 + 628019031.

It is an arithmetic number, because the mean of its divisors is an integer number (628019031).

Almost surely, 2^1256038061 is an apocalyptic number.

It is an amenable number.

1256038061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256038061 is an equidigital number, since it uses as much as digits as its factorization.

1256038061 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 32.

The square root of 1256038061 is about 35440.6272658936. The cubic root of 1256038061 is about 1078.9490407897.

The spelling of 1256038061 in words is "one billion, two hundred fifty-six million, thirty-eight thousand, sixty-one".