1025765521 has 12 divisors (see below), whose sum is σ = 1186838800. Its totient is φ = 883432440.

The previous prime is 1025765519. The next prime is 1025765549. The reversal of 1025765521 is 1255675201.

1025765521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1025765521 - 2¹ = 1025765519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1025765561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 220791 + ... + 225388.

Almost surely, 2^1025765521 is an apocalyptic number.

1025765521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1025765521 is a deficient number, since it is larger than the sum of its proper divisors (161073279).

1025765521 is a wasteful number, since it uses less digits than its factorization.

1025765521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446220 (or 446209 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 1025765521 is about 32027.5743852075. The cubic root of 1025765521 is about 1008.5157825960.

The spelling of 1025765521 in words is "one billion, twenty-five million, seven hundred sixty-five thousand, five hundred twenty-one".