129551501 has 2 divisors, whose sum is σ = 129551502. Its totient is φ = 129551500.

The previous prime is 129551489. The next prime is 129551531. The reversal of 129551501 is 105155921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122655625 + 6895876 = 11075^2 + 2626^2 .

It is a cyclic number.

It is not a de Polignac number, because 129551501 - 2⁶ = 129551437 is a prime.

It is a super-2 number, since 2×129551501² = 33567182822706002, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129551531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64775750 + 64775751.

It is an arithmetic number, because the mean of its divisors is an integer number (64775751).

Almost surely, 2^129551501 is an apocalyptic number.

It is an amenable number.

129551501 is a deficient number, since it is larger than the sum of its proper divisors (1).

129551501 is an equidigital number, since it uses as much as digits as its factorization.

129551501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2250, while the sum is 29.

The square root of 129551501 is about 11382.0692758391. The cubic root of 129551501 is about 505.9964653161.

The spelling of 129551501 in words is "one hundred twenty-nine million, five hundred fifty-one thousand, five hundred one".