129691213 has 2 divisors, whose sum is σ = 129691214. Its totient is φ = 129691212.

The previous prime is 129691183. The next prime is 129691217. The reversal of 129691213 is 312196921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96766569 + 32924644 = 9837^2 + 5738^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129691213 is a prime.

It is a super-2 number, since 2×129691213² = 33639621458822738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129691217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64845606 + 64845607.

It is an arithmetic number, because the mean of its divisors is an integer number (64845607).

Almost surely, 2^129691213 is an apocalyptic number.

It is an amenable number.

129691213 is a deficient number, since it is larger than the sum of its proper divisors (1).

129691213 is an equidigital number, since it uses as much as digits as its factorization.

129691213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 34.

The square root of 129691213 is about 11388.2049946425. The cubic root of 129691213 is about 506.1782935983.

The spelling of 129691213 in words is "one hundred twenty-nine million, six hundred ninety-one thousand, two hundred thirteen".