129257447954 has 8 divisors (see below), whose sum is σ = 194244558348. Its totient is φ = 64509261840.

The previous prime is 129257447951. The next prime is 129257447983. The reversal of 129257447954 is 459744752921.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 127045909225 + 2211538729 = 356435^2 + 47027^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×129257447954² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 129257447893 and 129257447902.

It is not an unprimeable number, because it can be changed into a prime (129257447951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59729717 + ... + 59731880.

Almost surely, 2^129257447954 is an apocalyptic number.

129257447954 is a deficient number, since it is larger than the sum of its proper divisors (64987110394).

129257447954 is a wasteful number, since it uses less digits than its factorization.

129257447954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119462140.

The product of its digits is 25401600, while the sum is 59.

The spelling of 129257447954 in words is "one hundred twenty-nine billion, two hundred fifty-seven million, four hundred forty-seven thousand, nine hundred fifty-four".