54219293981 has 2 divisors, whose sum is σ = 54219293982. Its totient is φ = 54219293980.

The previous prime is 54219293939. The next prime is 54219294001. The reversal of 54219293981 is 18939291245.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50897616025 + 3321677956 = 225605^2 + 57634^2 .

It is a cyclic number.

It is not a de Polignac number, because 54219293981 - 2²⁶ = 54152185117 is a prime.

It is a super-2 number, since 2×54219293981² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54219293081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27109646990 + 27109646991.

It is an arithmetic number, because the mean of its divisors is an integer number (27109646991).

Almost surely, 2^54219293981 is an apocalyptic number.

It is an amenable number.

54219293981 is a deficient number, since it is larger than the sum of its proper divisors (1).

54219293981 is an equidigital number, since it uses as much as digits as its factorization.

54219293981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 53.

The spelling of 54219293981 in words is "fifty-four billion, two hundred nineteen million, two hundred ninety-three thousand, nine hundred eighty-one".