1621241256 has 32 divisors (see below), whose sum is σ = 4057352640. Its totient is φ = 539847168.

The previous prime is 1621241243. The next prime is 1621241267. The reversal of 1621241256 is 6521421261.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11721 + ... + 58136.

It is an arithmetic number, because the mean of its divisors is an integer number (126792270).

Almost surely, 2^1621241256 is an apocalyptic number.

It is an amenable number.

1621241256 is an abundant number, since it is smaller than the sum of its proper divisors (2436111384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1621241256 is a wasteful number, since it uses less digits than its factorization.

1621241256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70833 (or 70829 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 1621241256 is about 40264.6402690996. The cubic root of 1621241256 is about 1174.7601758313.

The spelling of 1621241256 in words is "one billion, six hundred twenty-one million, two hundred forty-one thousand, two hundred fifty-six".