129918077 has 2 divisors, whose sum is σ = 129918078. Its totient is φ = 129918076.

The previous prime is 129918049. The next prime is 129918101. The reversal of 129918077 is 770819921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122633476 + 7284601 = 11074^2 + 2699^2 .

It is a cyclic number.

It is not a de Polignac number, because 129918077 - 2¹² = 129913981 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129918037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64959038 + 64959039.

It is an arithmetic number, because the mean of its divisors is an integer number (64959039).

Almost surely, 2^129918077 is an apocalyptic number.

It is an amenable number.

129918077 is a deficient number, since it is larger than the sum of its proper divisors (1).

129918077 is an equidigital number, since it uses as much as digits as its factorization.

129918077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 44.

The square root of 129918077 is about 11398.1611236199. The cubic root of 129918077 is about 506.4732679369.

The spelling of 129918077 in words is "one hundred twenty-nine million, nine hundred eighteen thousand, seventy-seven".