1256250641 has 8 divisors (see below), whose sum is σ = 1275523200. Its totient is φ = 1237022080.

The previous prime is 1256250631. The next prime is 1256250643. The reversal of 1256250641 is 1460526521.

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

It is a cyclic number.

It is not a de Polignac number, because 1256250641 - 2⁶ = 1256250577 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1256250598 and 1256250607.

It is not an unprimeable number, because it can be changed into a prime (1256250643) 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, 49025 + ... + 70113.

It is an arithmetic number, because the mean of its divisors is an integer number (159440400).

Almost surely, 2^1256250641 is an apocalyptic number.

It is an amenable number.

1256250641 is a deficient number, since it is larger than the sum of its proper divisors (19272559).

1256250641 is an equidigital number, since it uses as much as digits as its factorization.

1256250641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21999.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 1256250641 is about 35443.6262394242. The cubic root of 1256250641 is about 1079.0099067926.

The spelling of 1256250641 in words is "one billion, two hundred fifty-six million, two hundred fifty thousand, six hundred forty-one".