1954105399 has 2 divisors, whose sum is σ = 1954105400. Its totient is φ = 1954105398.

The previous prime is 1954105357. The next prime is 1954105421. The reversal of 1954105399 is 9935014591.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1954105399 - 2¹³ = 1954097207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1954105199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977052699 + 977052700.

It is an arithmetic number, because the mean of its divisors is an integer number (977052700).

Almost surely, 2^1954105399 is an apocalyptic number.

1954105399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1954105399 is an equidigital number, since it uses as much as digits as its factorization.

1954105399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 218700, while the sum is 46.

The square root of 1954105399 is about 44205.2643810667. The cubic root of 1954105399 is about 1250.2091168008.

The spelling of 1954105399 in words is "one billion, nine hundred fifty-four million, one hundred five thousand, three hundred ninety-nine".