1621174868 has 6 divisors (see below), whose sum is σ = 2837056026. Its totient is φ = 810587432.

The previous prime is 1621174861. The next prime is 1621174873. The reversal of 1621174868 is 8684711261.

It can be written as a sum of positive squares in only one way, i.e., 1568001604 + 53173264 = 39598^2 + 7292^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621174861) 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 as a sum of consecutive naturals, namely, 202646855 + ... + 202646862.

It is an arithmetic number, because the mean of its divisors is an integer number (472842671).

Almost surely, 2^1621174868 is an apocalyptic number.

It is an amenable number.

1621174868 is a deficient number, since it is larger than the sum of its proper divisors (1215881158).

1621174868 is a wasteful number, since it uses less digits than its factorization.

1621174868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405293721 (or 405293719 counting only the distinct ones).

The product of its digits is 129024, while the sum is 44.

The square root of 1621174868 is about 40263.8158648680. The cubic root of 1621174868 is about 1174.7441405779.

The spelling of 1621174868 in words is "one billion, six hundred twenty-one million, one hundred seventy-four thousand, eight hundred sixty-eight".