1621711411 has 4 divisors (see below), whose sum is σ = 1624242024. Its totient is φ = 1619180800.

The previous prime is 1621711397. The next prime is 1621711457. The reversal of 1621711411 is 1141171261.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1621711411 - 2⁷ = 1621711283 is a prime.

It is a super-2 number, since 2×1621711411² = 5259895801135221842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1621711811) 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, 1264345 + ... + 1265626.

It is an arithmetic number, because the mean of its divisors is an integer number (406060506).

Almost surely, 2^1621711411 is an apocalyptic number.

1621711411 is a deficient number, since it is larger than the sum of its proper divisors (2530613).

1621711411 is an equidigital number, since it uses as much as digits as its factorization.

1621711411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2530612.

The product of its digits is 336, while the sum is 25.

The square root of 1621711411 is about 40270.4781570818. The cubic root of 1621711411 is about 1174.8737238071.

Adding to 1621711411 its reverse (1141171261), we get a palindrome (2762882672).

The spelling of 1621711411 in words is "one billion, six hundred twenty-one million, seven hundred eleven thousand, four hundred eleven".