129980537 has 8 divisors (see below), whose sum is σ = 133305480. Its totient is φ = 126663040.

The previous prime is 129980533. The next prime is 129980611. The reversal of 129980537 is 735089921.

It can be written as a sum of positive squares in 4 ways, for example, as 45414121 + 84566416 = 6739^2 + 9196^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129980537 - 2² = 129980533 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129980533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55139 + ... + 57447.

It is an arithmetic number, because the mean of its divisors is an integer number (16663185).

Almost surely, 2^129980537 is an apocalyptic number.

It is an amenable number.

129980537 is a deficient number, since it is larger than the sum of its proper divisors (3324943).

129980537 is a wasteful number, since it uses less digits than its factorization.

129980537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3723.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 129980537 is about 11400.9007100316. The cubic root of 129980537 is about 506.5544197234.

The spelling of 129980537 in words is "one hundred twenty-nine million, nine hundred eighty thousand, five hundred thirty-seven".