1954556839 has 2 divisors, whose sum is σ = 1954556840. Its totient is φ = 1954556838.

The previous prime is 1954556777. The next prime is 1954556953. The reversal of 1954556839 is 9386554591.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1954556839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1954556839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1954554839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977278419 + 977278420.

It is an arithmetic number, because the mean of its divisors is an integer number (977278420).

Almost surely, 2^1954556839 is an apocalyptic number.

1954556839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1954556839 is an equidigital number, since it uses as much as digits as its factorization.

1954556839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832000, while the sum is 55.

The square root of 1954556839 is about 44210.3702653574. The cubic root of 1954556839 is about 1250.3053843729.

The spelling of 1954556839 in words is "one billion, nine hundred fifty-four million, five hundred fifty-six thousand, eight hundred thirty-nine".