1954669813 has 2 divisors, whose sum is σ = 1954669814. Its totient is φ = 1954669812.

The previous prime is 1954669811. The next prime is 1954669883. The reversal of 1954669813 is 3189664591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1389276529 + 565393284 = 37273^2 + 23778^2 .

It is a cyclic number.

It is not a de Polignac number, because 1954669813 - 2¹ = 1954669811 is a prime.

Together with 1954669811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1954669811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977334906 + 977334907.

It is an arithmetic number, because the mean of its divisors is an integer number (977334907).

Almost surely, 2^1954669813 is an apocalyptic number.

It is an amenable number.

1954669813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1954669813 is an equidigital number, since it uses as much as digits as its factorization.

1954669813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 52.

The square root of 1954669813 is about 44211.6479335480. The cubic root of 1954669813 is about 1250.3294732569.

The spelling of 1954669813 in words is "one billion, nine hundred fifty-four million, six hundred sixty-nine thousand, eight hundred thirteen".