129978263 has 2 divisors, whose sum is σ = 129978264. Its totient is φ = 129978262.

The previous prime is 129978253. The next prime is 129978269. The reversal of 129978263 is 362879921.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129978263 - 2¹² = 129974167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129978269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64989131 + 64989132.

It is an arithmetic number, because the mean of its divisors is an integer number (64989132).

Almost surely, 2^129978263 is an apocalyptic number.

129978263 is a deficient number, since it is larger than the sum of its proper divisors (1).

129978263 is an equidigital number, since it uses as much as digits as its factorization.

129978263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 47.

The square root of 129978263 is about 11400.8009806329. The cubic root of 129978263 is about 506.5514656619.

The spelling of 129978263 in words is "one hundred twenty-nine million, nine hundred seventy-eight thousand, two hundred sixty-three".