1621332156 has 48 divisors (see below), whose sum is σ = 3894597504. Its totient is φ = 524586816.

The previous prime is 1621332151. The next prime is 1621332173. The reversal of 1621332156 is 6512331261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621332151) 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 in 15 ways as a sum of consecutive naturals, for example, 192571 + ... + 200813.

It is an arithmetic number, because the mean of its divisors is an integer number (81137448).

Almost surely, 2^1621332156 is an apocalyptic number.

It is an amenable number.

1621332156 is an abundant number, since it is smaller than the sum of its proper divisors (2273265348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1621332156 is a wasteful number, since it uses less digits than its factorization.

1621332156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8730 (or 8728 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 1621332156 is about 40265.7690352488. The cubic root of 1621332156 is about 1174.7821309647.

The spelling of 1621332156 in words is "one billion, six hundred twenty-one million, three hundred thirty-two thousand, one hundred fifty-six".