1621163203 has 12 divisors (see below), whose sum is σ = 1785866544. Its totient is φ = 1470537200.

The previous prime is 1621163183. The next prime is 1621163209. The reversal of 1621163203 is 3023611261.

It is a de Polignac number, because none of the positive numbers 2^k-1621163203 is a prime.

It is a super-2 number, since 2×1621163203² = 5256340261522438418, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1621163209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41250 + ... + 70312.

It is an arithmetic number, because the mean of its divisors is an integer number (148822212).

Almost surely, 2^1621163203 is an apocalyptic number.

1621163203 is a deficient number, since it is larger than the sum of its proper divisors (164703341).

1621163203 is a wasteful number, since it uses less digits than its factorization.

1621163203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29546 (or 29535 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1621163203 is about 40263.6710074976. The cubic root of 1621163203 is about 1174.7413229869.

Adding to 1621163203 its reverse (3023611261), we get a palindrome (4644774464).

The spelling of 1621163203 in words is "one billion, six hundred twenty-one million, one hundred sixty-three thousand, two hundred three".