3111650021 has 2 divisors, whose sum is σ = 3111650022. Its totient is φ = 3111650020.

The previous prime is 3111649991. The next prime is 3111650053. The reversal of 3111650021 is 1200561113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2941869121 + 169780900 = 54239^2 + 13030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3111650021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3111649975 and 3111650002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3111650621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1555825010 + 1555825011.

It is an arithmetic number, because the mean of its divisors is an integer number (1555825011).

Almost surely, 2^3111650021 is an apocalyptic number.

It is an amenable number.

3111650021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3111650021 is an equidigital number, since it uses as much as digits as its factorization.

3111650021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 3111650021 is about 55782.1657969642. The cubic root of 3111650021 is about 1459.9240000784.

The spelling of 3111650021 in words is "three billion, one hundred eleven million, six hundred fifty thousand, twenty-one".