6118211961 has 21 divisors (see below), whose sum is σ = 9176289151. Its totient is φ = 4077400032.

The previous prime is 6118211941. The next prime is 6118211963. The reversal of 6118211961 is 1691128116.

It is a happy number.

The square root of 6118211961 is 78219.

It is a perfect power (a square), and thus also a powerful number.

6118211961 is a `hidden beast` number, since 611 + 8 + 21 + 19 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 693005625 + 5425206336 = 26325^2 + 73656^2 .

It is not a de Polignac number, because 6118211961 - 2¹⁷ = 6118080889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6118211963) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 2110465 + ... + 2113361.

Almost surely, 2^6118211961 is an apocalyptic number.

6118211961 is the 78219-th square number.

6118211961 is the 39110-th centered octagonal number.

It is an amenable number.

6118211961 is a deficient number, since it is larger than the sum of its proper divisors (3058077190).

6118211961 is an frugal number, since it uses more digits than its factorization.

6118211961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5812 (or 2900 counting only the distinct ones).

The product of its digits is 5184, while the sum is 36.

The cubic root of 6118211961 is about 1828.9767001362.

Multiplying 6118211961 by its sum of digits (36), we get a square (220255630596 = 469314²).

Multiplying 6118211961 by its product of digits (5184), we get a square (31716810805824 = 5631768²).

The spelling of 6118211961 in words is "six billion, one hundred eighteen million, two hundred eleven thousand, nine hundred sixty-one".