1945111361 has 2 divisors, whose sum is σ = 1945111362. Its totient is φ = 1945111360.

The previous prime is 1945111319. The next prime is 1945111379. The reversal of 1945111361 is 1631115491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1927210000 + 17901361 = 43900^2 + 4231^2 .

It is a cyclic number.

It is not a de Polignac number, because 1945111361 - 2¹⁸ = 1944849217 is a prime.

It is a super-3 number, since 3×1945111361³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1945411361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972555680 + 972555681.

It is an arithmetic number, because the mean of its divisors is an integer number (972555681).

Almost surely, 2^1945111361 is an apocalyptic number.

It is an amenable number.

1945111361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1945111361 is an equidigital number, since it uses as much as digits as its factorization.

1945111361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 32.

The square root of 1945111361 is about 44103.4166590299. The cubic root of 1945111361 is about 1248.2880802148.

The spelling of 1945111361 in words is "one billion, nine hundred forty-five million, one hundred eleven thousand, three hundred sixty-one".