1621356164 has 48 divisors (see below), whose sum is σ = 3047733360. Its totient is φ = 752025600.

The previous prime is 1621356161. The next prime is 1621356197. The reversal of 1621356164 is 4616531261.

It can be written as a sum of positive squares in 8 ways, for example, as 447745600 + 1173610564 = 21160^2 + 34258^2 .

It is not an unprimeable number, because it can be changed into a prime (1621356161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2697464 + ... + 2698064.

It is an arithmetic number, because the mean of its divisors is an integer number (63494445).

Almost surely, 2^1621356164 is an apocalyptic number.

It is an amenable number.

1621356164 is a deficient number, since it is larger than the sum of its proper divisors (1426377196).

1621356164 is a wasteful number, since it uses less digits than its factorization.

1621356164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128 (or 1126 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The square root of 1621356164 is about 40266.0671533737. The cubic root of 1621356164 is about 1174.7879294949.

The spelling of 1621356164 in words is "one billion, six hundred twenty-one million, three hundred fifty-six thousand, one hundred sixty-four".