1621768532 has 6 divisors (see below), whose sum is σ = 2838094938. Its totient is φ = 810884264.

The previous prime is 1621768531. The next prime is 1621768543. The reversal of 1621768532 is 2358671261.

It can be written as a sum of positive squares in only one way, i.e., 886491076 + 735277456 = 29774^2 + 27116^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1621768532.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621768531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202721063 + ... + 202721070.

It is an arithmetic number, because the mean of its divisors is an integer number (473015823).

Almost surely, 2^1621768532 is an apocalyptic number.

It is an amenable number.

1621768532 is a deficient number, since it is larger than the sum of its proper divisors (1216326406).

1621768532 is a wasteful number, since it uses less digits than its factorization.

1621768532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405442137 (or 405442135 counting only the distinct ones).

The product of its digits is 120960, while the sum is 41.

The square root of 1621768532 is about 40271.1873676454. The cubic root of 1621768532 is about 1174.8875177069.

The spelling of 1621768532 in words is "one billion, six hundred twenty-one million, seven hundred sixty-eight thousand, five hundred thirty-two".