429720891961 has 3 divisors (see below), whose sum is σ = 429721547493. Its totient is φ = 429720236430.

The previous prime is 429720891949. The next prime is 429720891983. The reversal of 429720891961 is 169198027924.

The square root of 429720891961 is 655531.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 429720891961 - 2⁷ = 429720891833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 429720891896 and 429720891905.

It is not an unprimeable number, because it can be changed into a prime (429720891911) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 327766 + ... + 983296.

It is an arithmetic number, because the mean of its divisors is an integer number (143240515831).

Almost surely, 2^429720891961 is an apocalyptic number.

429720891961 is the 655531-st square number.

429720891961 is the 327766-th centered octagonal number.

It is an amenable number.

429720891961 is a deficient number, since it is larger than the sum of its proper divisors (655532).

429720891961 is an frugal number, since it uses more digits than its factorization.

429720891961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311062 (or 655531 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 58.

The spelling of 429720891961 in words is "four hundred twenty-nine billion, seven hundred twenty million, eight hundred ninety-one thousand, nine hundred sixty-one".