1256225515 has 8 divisors (see below), whose sum is σ = 1516719888. Its totient is φ = 998814240.

The previous prime is 1256225513. The next prime is 1256225611. The reversal of 1256225515 is 5155226521.

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

It is not a de Polignac number, because 1256225515 - 2¹ = 1256225513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256225513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 769876 + ... + 771505.

It is an arithmetic number, because the mean of its divisors is an integer number (189589986).

Almost surely, 2^1256225515 is an apocalyptic number.

1256225515 is a deficient number, since it is larger than the sum of its proper divisors (260494373).

1256225515 is a wasteful number, since it uses less digits than its factorization.

1256225515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541549.

The product of its digits is 30000, while the sum is 34.

The square root of 1256225515 is about 35443.2717874634. The cubic root of 1256225515 is about 1079.0027130626.

The spelling of 1256225515 in words is "one billion, two hundred fifty-six million, two hundred twenty-five thousand, five hundred fifteen".