1285020621 has 12 divisors (see below), whose sum is σ = 1857403548. Its totient is φ = 856097664.

The previous prime is 1285020617. The next prime is 1285020629. The reversal of 1285020621 is 1260205821.

It is a happy number.

1285020621 is a `hidden beast` number, since 12 + 8 + 5 + 0 + 20 + 621 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 659770596 + 625250025 = 25686^2 + 25005^2 .

It is not a de Polignac number, because 1285020621 - 2² = 1285020617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285020629) 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 11 ways as a sum of consecutive naturals, for example, 34380 + ... + 61253.

It is an arithmetic number, because the mean of its divisors is an integer number (154783629).

Almost surely, 2^1285020621 is an apocalyptic number.

It is an amenable number.

1285020621 is a deficient number, since it is larger than the sum of its proper divisors (572382927).

1285020621 is a wasteful number, since it uses less digits than its factorization.

1285020621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97132 (or 97129 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 1285020621 is about 35847.1842827299. The cubic root of 1285020621 is about 1087.1847844253.

The spelling of 1285020621 in words is "one billion, two hundred eighty-five million, twenty thousand, six hundred twenty-one".