1621154532 has 12 divisors (see below), whose sum is σ = 3782693936. Its totient is φ = 540384840.

The previous prime is 1621154477. The next prime is 1621154569. The reversal of 1621154532 is 2354511261.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1621154532.

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, 67548094 + ... + 67548117.

Almost surely, 2^1621154532 is an apocalyptic number.

1621154532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1621154532 is an abundant number, since it is smaller than the sum of its proper divisors (2161539404).

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

1621154532 is a wasteful number, since it uses less digits than its factorization.

1621154532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135096218 (or 135096216 counting only the distinct ones).

The product of its digits is 7200, while the sum is 30.

The square root of 1621154532 is about 40263.5633296409. The cubic root of 1621154532 is about 1174.7392285647.

Adding to 1621154532 its reverse (2354511261), we get a palindrome (3975665793).

The spelling of 1621154532 in words is "one billion, six hundred twenty-one million, one hundred fifty-four thousand, five hundred thirty-two".