129148402 has 4 divisors (see below), whose sum is σ = 193722606. Its totient is φ = 64574200.

The previous prime is 129148399. The next prime is 129148403. The reversal of 129148402 is 204841921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 204841921 = 677 ⋅302573.

It can be written as a sum of positive squares in only one way, i.e., 120802081 + 8346321 = 10991^2 + 2889^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (129148403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32287099 + ... + 32287102.

Almost surely, 2^129148402 is an apocalyptic number.

129148402 is a deficient number, since it is larger than the sum of its proper divisors (64574204).

129148402 is an equidigital number, since it uses as much as digits as its factorization.

129148402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64574203.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 129148402 is about 11364.3478475450. The cubic root of 129148402 is about 505.4711180444.

It can be divided in two parts, 12914 and 8402, that added together give a square (21316 = 146²).

The spelling of 129148402 in words is "one hundred twenty-nine million, one hundred forty-eight thousand, four hundred two".