1945161949 has 2 divisors, whose sum is σ = 1945161950. Its totient is φ = 1945161948.

The previous prime is 1945161857. The next prime is 1945161983. The reversal of 1945161949 is 9491615491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1273419225 + 671742724 = 35685^2 + 25918^2 .

It is a cyclic number.

It is not a de Polignac number, because 1945161949 - 2⁷ = 1945161821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1945161989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972580974 + 972580975.

It is an arithmetic number, because the mean of its divisors is an integer number (972580975).

Almost surely, 2^1945161949 is an apocalyptic number.

It is an amenable number.

1945161949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1945161949 is an equidigital number, since it uses as much as digits as its factorization.

1945161949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 49.

The square root of 1945161949 is about 44103.9901709585. The cubic root of 1945161949 is about 1248.2989018489.

The spelling of 1945161949 in words is "one billion, nine hundred forty-five million, one hundred sixty-one thousand, nine hundred forty-nine".