1621116911 has 2 divisors, whose sum is σ = 1621116912. Its totient is φ = 1621116910.

The previous prime is 1621116881. The next prime is 1621116941. The reversal of 1621116911 is 1196111261.

It is a balanced prime because it is at equal distance from previous prime (1621116881) and next prime (1621116941).

It is a cyclic number.

It is not a de Polignac number, because 1621116911 - 2¹⁰ = 1621115887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621116941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810558455 + 810558456.

It is an arithmetic number, because the mean of its divisors is an integer number (810558456).

Almost surely, 2^1621116911 is an apocalyptic number.

1621116911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621116911 is an equidigital number, since it uses as much as digits as its factorization.

1621116911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 29.

The square root of 1621116911 is about 40263.0961427459. The cubic root of 1621116911 is about 1174.7301413771.

The spelling of 1621116911 in words is "one billion, six hundred twenty-one million, one hundred sixteen thousand, nine hundred eleven".