129791377 has 2 divisors, whose sum is σ = 129791378. Its totient is φ = 129791376.

The previous prime is 129791357. The next prime is 129791381. The reversal of 129791377 is 773197921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98386561 + 31404816 = 9919^2 + 5604^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129791377 is a prime.

It is a super-2 number, since 2×129791377² = 33691603087112258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129791357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64895688 + 64895689.

It is an arithmetic number, because the mean of its divisors is an integer number (64895689).

Almost surely, 2^129791377 is an apocalyptic number.

It is an amenable number.

129791377 is a deficient number, since it is larger than the sum of its proper divisors (1).

129791377 is an equidigital number, since it uses as much as digits as its factorization.

129791377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 166698, while the sum is 46.

The square root of 129791377 is about 11392.6018538348. The cubic root of 129791377 is about 506.3085717528.

The spelling of 129791377 in words is "one hundred twenty-nine million, seven hundred ninety-one thousand, three hundred seventy-seven".