129896501 has 10 divisors (see below), whose sum is σ = 151539702. Its totient is φ = 111337800.

The previous prime is 129896491. The next prime is 129896509. The reversal of 129896501 is 105698921.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 122633476 + 7263025 = 11074^2 + 2695^2 .

It is not a de Polignac number, because 129896501 - 2¹⁸ = 129634357 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129896509) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 24650 + ... + 29451.

Almost surely, 2^129896501 is an apocalyptic number.

It is an amenable number.

129896501 is a deficient number, since it is larger than the sum of its proper divisors (21643201).

129896501 is an frugal number, since it uses more digits than its factorization.

129896501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54129 (or 54108 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 129896501 is about 11397.2146158612. The cubic root of 129896501 is about 506.4452290567.

The spelling of 129896501 in words is "one hundred twenty-nine million, eight hundred ninety-six thousand, five hundred one".