1256423061 has 8 divisors (see below), whose sum is σ = 1700234464. Its totient is φ = 825113520.

The previous prime is 1256423033. The next prime is 1256423083. The reversal of 1256423061 is 1603246521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1256423061 - 2⁷ = 1256422933 is a prime.

It is a super-3 number, since 3×1256423061³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256423011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3125230 + ... + 3125631.

It is an arithmetic number, because the mean of its divisors is an integer number (212529308).

Almost surely, 2^1256423061 is an apocalyptic number.

It is an amenable number.

1256423061 is a deficient number, since it is larger than the sum of its proper divisors (443811403).

1256423061 is an equidigital number, since it uses as much as digits as its factorization.

1256423061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6250931.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1256423061 is about 35446.0584691726. The cubic root of 1256423061 is about 1079.0592691229.

Adding to 1256423061 its reverse (1603246521), we get a palindrome (2859669582).

The spelling of 1256423061 in words is "one billion, two hundred fifty-six million, four hundred twenty-three thousand, sixty-one".