1020256251 has 16 divisors (see below), whose sum is σ = 1558790400. Its totient is φ = 581460768.

The previous prime is 1020256219. The next prime is 1020256253. The reversal of 1020256251 is 1526520201.

It is a happy number.

It is not a de Polignac number, because 1020256251 - 2⁵ = 1020256219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1020256253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56136 + ... + 72053.

It is an arithmetic number, because the mean of its divisors is an integer number (97424400).

Almost surely, 2^1020256251 is an apocalyptic number.

1020256251 is a deficient number, since it is larger than the sum of its proper divisors (538534149).

1020256251 is a wasteful number, since it uses less digits than its factorization.

1020256251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128578.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1020256251 is about 31941.4503584292. The cubic root of 1020256251 is about 1006.7069992588.

Adding to 1020256251 its reverse (1526520201), we get a palindrome (2546776452).

The spelling of 1020256251 in words is "one billion, twenty million, two hundred fifty-six thousand, two hundred fifty-one".