1213078553 has 2 divisors, whose sum is σ = 1213078554. Its totient is φ = 1213078552.

The previous prime is 1213078487. The next prime is 1213078567. The reversal of 1213078553 is 3558703121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1061000329 + 152078224 = 32573^2 + 12332^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213078553 - 2²² = 1208884249 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213078253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606539276 + 606539277.

It is an arithmetic number, because the mean of its divisors is an integer number (606539277).

Almost surely, 2^1213078553 is an apocalyptic number.

It is an amenable number.

1213078553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213078553 is an equidigital number, since it uses as much as digits as its factorization.

1213078553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 1213078553 is about 34829.2772391274. The cubic root of 1213078553 is about 1066.5051939927.

The spelling of 1213078553 in words is "one billion, two hundred thirteen million, seventy-eight thousand, five hundred fifty-three".