129964661 has 4 divisors (see below), whose sum is σ = 131179392. Its totient is φ = 128749932.

The previous prime is 129964649. The next prime is 129964687. The reversal of 129964661 is 166469921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 166469921 = 1129 ⋅147449.

It is a cyclic number.

It is not a de Polignac number, because 129964661 - 2²² = 125770357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129964691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607205 + ... + 607418.

It is an arithmetic number, because the mean of its divisors is an integer number (32794848).

Almost surely, 2^129964661 is an apocalyptic number.

It is an amenable number.

129964661 is a deficient number, since it is larger than the sum of its proper divisors (1214731).

129964661 is a wasteful number, since it uses less digits than its factorization.

129964661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1214730.

The product of its digits is 139968, while the sum is 44.

The square root of 129964661 is about 11400.2044279916. The cubic root of 129964661 is about 506.5337951345.

The spelling of 129964661 in words is "one hundred twenty-nine million, nine hundred sixty-four thousand, six hundred sixty-one".