20131954477 has 2 divisors, whose sum is σ = 20131954478. Its totient is φ = 20131954476.

The previous prime is 20131954463. The next prime is 20131954481. The reversal of 20131954477 is 77445913102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17052703396 + 3079251081 = 130586^2 + 55491^2 .

It is a cyclic number.

It is not a de Polignac number, because 20131954477 - 2¹⁵ = 20131921709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20131954417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10065977238 + 10065977239.

It is an arithmetic number, because the mean of its divisors is an integer number (10065977239).

Almost surely, 2^20131954477 is an apocalyptic number.

It is an amenable number.

20131954477 is a deficient number, since it is larger than the sum of its proper divisors (1).

20131954477 is an equidigital number, since it uses as much as digits as its factorization.

20131954477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 20131954477 in words is "twenty billion, one hundred thirty-one million, nine hundred fifty-four thousand, four hundred seventy-seven".