1621412564 has 12 divisors (see below), whose sum is σ = 2848022100. Its totient is φ = 807691968.

The previous prime is 1621412537. The next prime is 1621412581. The reversal of 1621412564 is 4652141261.

It can be written as a sum of positive squares in 2 ways, for example, as 165379600 + 1456032964 = 12860^2 + 38158^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1621412564.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 752369 + ... + 754520.

It is an arithmetic number, because the mean of its divisors is an integer number (237335175).

Almost surely, 2^1621412564 is an apocalyptic number.

It is an amenable number.

1621412564 is a deficient number, since it is larger than the sum of its proper divisors (1226609536).

1621412564 is a wasteful number, since it uses less digits than its factorization.

1621412564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507162 (or 1507160 counting only the distinct ones).

The product of its digits is 11520, while the sum is 32.

The square root of 1621412564 is about 40266.7674888363. The cubic root of 1621412564 is about 1174.8015512749.

The spelling of 1621412564 in words is "one billion, six hundred twenty-one million, four hundred twelve thousand, five hundred sixty-four".