129811450 has 12 divisors (see below), whose sum is σ = 241449390. Its totient is φ = 51924560.

The previous prime is 129811441. The next prime is 129811459. The reversal of 129811450 is 54118921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (129811441) and next prime (129811459).

It can be written as a sum of positive squares in 3 ways, for example, as 61732449 + 68079001 = 7857^2 + 8251^2 .

It is a super-2 number, since 2×129811450² = 33702025102205000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129811459) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1298065 + ... + 1298164.

Almost surely, 2^129811450 is an apocalyptic number.

129811450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129811450 is a deficient number, since it is larger than the sum of its proper divisors (111637940).

129811450 is a wasteful number, since it uses less digits than its factorization.

129811450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2596241 (or 2596236 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 129811450 is about 11393.4827862248. The cubic root of 129811450 is about 506.3346716071.

The spelling of 129811450 in words is "one hundred twenty-nine million, eight hundred eleven thousand, four hundred fifty".