1621161002 has 8 divisors (see below), whose sum is σ = 2431968516. Its totient is φ = 810504832.

The previous prime is 1621160977. The next prime is 1621161007. The reversal of 1621161002 is 2001611261.

It can be written as a sum of positive squares in 2 ways, for example, as 1618533361 + 2627641 = 40231^2 + 1621^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1621161007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5543 + ... + 57210.

Almost surely, 2^1621161002 is an apocalyptic number.

1621161002 is a deficient number, since it is larger than the sum of its proper divisors (810807514).

1621161002 is a wasteful number, since it uses less digits than its factorization.

1621161002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75672.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1621161002 is about 40263.6436751569. The cubic root of 1621161002 is about 1174.7407913507.

Adding to 1621161002 its reverse (2001611261), we get a palindrome (3622772263).

The spelling of 1621161002 in words is "one billion, six hundred twenty-one million, one hundred sixty-one thousand, two".