129137450 has 24 divisors (see below), whose sum is σ = 258673548. Its totient is φ = 47681280.

The previous prime is 129137447. The next prime is 129137453. The reversal of 129137450 is 54731921.

It is an interprime number because it is at equal distance from previous prime (129137447) and next prime (129137453).

It can be written as a sum of positive squares in 6 ways, for example, as 11566801 + 117570649 = 3401^2 + 10843^2 .

It is not an unprimeable number, because it can be changed into a prime (129137453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98687 + ... + 99986.

Almost surely, 2^129137450 is an apocalyptic number.

129137450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129137450 is an abundant number, since it is smaller than the sum of its proper divisors (129536098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129137450 is a wasteful number, since it uses less digits than its factorization.

129137450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198698 (or 198693 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 129137450 is about 11363.8659794984. The cubic root of 129137450 is about 505.4568293757.

The spelling of 129137450 in words is "one hundred twenty-nine million, one hundred thirty-seven thousand, four hundred fifty".