129663769 has 9 divisors (see below), whose sum is σ = 132585663. Its totient is φ = 126805632.

The previous prime is 129663767. The next prime is 129663803. The reversal of 129663769 is 967366921.

The square root of 129663769 is 11387.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 31416025 + 98247744 = 5605^2 + 9912^2 .

It is not a de Polignac number, because 129663769 - 2¹ = 129663767 is a prime.

It is a super-2 number, since 2×129663769² = 33625385982570722, which contains 22 as substring.

It is a Duffinian number.

Its product of digits (734832) is a multiple of the sum of its prime divisors (252).

It is not an unprimeable number, because it can be changed into a prime (129663761) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 671737 + ... + 671929.

Almost surely, 2^129663769 is an apocalyptic number.

129663769 is the 11387-th square number.

129663769 is the 5694-th centered octagonal number.

It is an amenable number.

129663769 is a deficient number, since it is larger than the sum of its proper divisors (2921894).

129663769 is an frugal number, since it uses more digits than its factorization.

129663769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504 (or 252 counting only the distinct ones).

The product of its digits is 734832, while the sum is 49.

The cubic root of 129663769 is about 506.1425868948.

Multiplying 129663769 by its sum of digits (49), we get a square (6353524681 = 79709²).

The spelling of 129663769 in words is "one hundred twenty-nine million, six hundred sixty-three thousand, seven hundred sixty-nine".