129951823 has 2 divisors, whose sum is σ = 129951824. Its totient is φ = 129951822.

The previous prime is 129951781. The next prime is 129951839. The reversal of 129951823 is 328159921.

It is a strong prime.

It is an emirp because it is prime and its reverse (328159921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129951823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129954823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64975911 + 64975912.

It is an arithmetic number, because the mean of its divisors is an integer number (64975912).

Almost surely, 2^129951823 is an apocalyptic number.

129951823 is a deficient number, since it is larger than the sum of its proper divisors (1).

129951823 is an equidigital number, since it uses as much as digits as its factorization.

129951823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 40.

The square root of 129951823 is about 11399.6413540076. The cubic root of 129951823 is about 506.5171159979.

The spelling of 129951823 in words is "one hundred twenty-nine million, nine hundred fifty-one thousand, eight hundred twenty-three".