1978553233 has 2 divisors, whose sum is σ = 1978553234. Its totient is φ = 1978553232.

The previous prime is 1978553209. The next prime is 1978553267. The reversal of 1978553233 is 3323558791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1068505344 + 910047889 = 32688^2 + 30167^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1978553233 is a prime.

It is not a weakly prime, because it can be changed into another prime (1978553033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989276616 + 989276617.

It is an arithmetic number, because the mean of its divisors is an integer number (989276617).

Almost surely, 2^1978553233 is an apocalyptic number.

It is an amenable number.

1978553233 is a deficient number, since it is larger than the sum of its proper divisors (1).

1978553233 is an equidigital number, since it uses as much as digits as its factorization.

1978553233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 46.

The square root of 1978553233 is about 44480.9311166032. The cubic root of 1978553233 is about 1255.4013167120.

The spelling of 1978553233 in words is "one billion, nine hundred seventy-eight million, five hundred fifty-three thousand, two hundred thirty-three".