1621255364 has 12 divisors (see below), whose sum is σ = 2837543100. Its totient is φ = 810528768.

The previous prime is 1621255357. The next prime is 1621255369. The reversal of 1621255364 is 4635521261.

It can be written as a sum of positive squares in 2 ways, for example, as 269222464 + 1352032900 = 16408^2 + 36770^2 .

It is a super-3 number, since 3×1621255364³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1621255369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21932 + ... + 61020.

It is an arithmetic number, because the mean of its divisors is an integer number (236461925).

Almost surely, 2^1621255364 is an apocalyptic number.

It is an amenable number.

1621255364 is a deficient number, since it is larger than the sum of its proper divisors (1216287736).

1621255364 is a wasteful number, since it uses less digits than its factorization.

1621255364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49462 (or 49460 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

The square root of 1621255364 is about 40264.8154596541. The cubic root of 1621255364 is about 1174.7635833991.

The spelling of 1621255364 in words is "one billion, six hundred twenty-one million, two hundred fifty-five thousand, three hundred sixty-four".