1621311103 has 8 divisors (see below), whose sum is σ = 1671471648. Its totient is φ = 1571484384.

The previous prime is 1621311077. The next prime is 1621311121. The reversal of 1621311103 is 3011131261.

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

It is a cyclic number.

It is not a de Polignac number, because 1621311103 - 2¹⁷ = 1621180031 is a prime.

It is a super-2 number, since 2×1621311103² = 5257299385422153218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621311803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73576 + ... + 93037.

It is an arithmetic number, because the mean of its divisors is an integer number (208933956).

Almost surely, 2^1621311103 is an apocalyptic number.

1621311103 is a deficient number, since it is larger than the sum of its proper divisors (50160545).

1621311103 is a wasteful number, since it uses less digits than its factorization.

1621311103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166913.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 1621311103 is about 40265.5076088704. The cubic root of 1621311103 is about 1174.7770460936. Note that the first 3 decimals are identical.

Adding to 1621311103 its reverse (3011131261), we get a palindrome (4632442364).

The spelling of 1621311103 in words is "one billion, six hundred twenty-one million, three hundred eleven thousand, one hundred three".