129191903 has 2 divisors, whose sum is σ = 129191904. Its totient is φ = 129191902.

The previous prime is 129191873. The next prime is 129191927. The reversal of 129191903 is 309191921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129191903 - 2¹⁶ = 129126367 is a prime.

It is a super-2 number, since 2×129191903² = 33381095601522818, which contains 22 as substring.

It is a Chen prime.

It is equal to p_7334945 and since 129191903 and 7334945 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129191003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64595951 + 64595952.

It is an arithmetic number, because the mean of its divisors is an integer number (64595952).

Almost surely, 2^129191903 is an apocalyptic number.

129191903 is a deficient number, since it is larger than the sum of its proper divisors (1).

129191903 is an equidigital number, since it uses as much as digits as its factorization.

129191903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 129191903 is about 11366.2616105736. The cubic root of 129191903 is about 505.5278642125.

The spelling of 129191903 in words is "one hundred twenty-nine million, one hundred ninety-one thousand, nine hundred three".