129521654 has 4 divisors (see below), whose sum is σ = 194282484. Its totient is φ = 64760826.

The previous prime is 129521641. The next prime is 129521663. The reversal of 129521654 is 456125921.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32380412 + ... + 32380415.

It is an arithmetic number, because the mean of its divisors is an integer number (48570621).

Almost surely, 2^129521654 is an apocalyptic number.

129521654 is a deficient number, since it is larger than the sum of its proper divisors (64760830).

129521654 is an equidigital number, since it uses as much as digits as its factorization.

129521654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64760829.

The product of its digits is 21600, while the sum is 35.

The square root of 129521654 is about 11380.7580591101. The cubic root of 129521654 is about 505.9576039718.

The spelling of 129521654 in words is "one hundred twenty-nine million, five hundred twenty-one thousand, six hundred fifty-four".