1978659503 has 2 divisors, whose sum is σ = 1978659504. Its totient is φ = 1978659502.

The previous prime is 1978659499. The next prime is 1978659511. The reversal of 1978659503 is 3059568791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1978659503 - 2² = 1978659499 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1978659803) 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, 989329751 + 989329752.

It is an arithmetic number, because the mean of its divisors is an integer number (989329752).

Almost surely, 2^1978659503 is an apocalyptic number.

1978659503 is a deficient number, since it is larger than the sum of its proper divisors (1).

1978659503 is an equidigital number, since it uses as much as digits as its factorization.

1978659503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2041200, while the sum is 53.

The square root of 1978659503 is about 44482.1256573919. The cubic root of 1978659503 is about 1255.4237925809.

The spelling of 1978659503 in words is "one billion, nine hundred seventy-eight million, six hundred fifty-nine thousand, five hundred three".