1020651256 has 32 divisors (see below), whose sum is σ = 1935077040. Its totient is φ = 504652288.

The previous prime is 1020651251. The next prime is 1020651271. The reversal of 1020651256 is 6521560201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020651251) 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 in 7 ways as a sum of consecutive naturals, for example, 502515 + ... + 504541.

Almost surely, 2^1020651256 is an apocalyptic number.

It is an amenable number.

1020651256 is a deficient number, since it is larger than the sum of its proper divisors (914425784).

1020651256 is a wasteful number, since it uses less digits than its factorization.

1020651256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2703 (or 2699 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1020651256 is about 31947.6330265640. The cubic root of 1020651256 is about 1006.8369022414.

The spelling of 1020651256 in words is "one billion, twenty million, six hundred fifty-one thousand, two hundred fifty-six".