3129434561 has 4 divisors (see below), whose sum is σ = 3413928624. Its totient is φ = 2844940500.

The previous prime is 3129434549. The next prime is 3129434587. The reversal of 3129434561 is 1654349213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1654349213 = 11 ⋅150395383.

It is a cyclic number.

It is not a de Polignac number, because 3129434561 - 2¹⁰ = 3129433537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3129434761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142247015 + ... + 142247036.

It is an arithmetic number, because the mean of its divisors is an integer number (853482156).

Almost surely, 2^3129434561 is an apocalyptic number.

It is an amenable number.

3129434561 is a deficient number, since it is larger than the sum of its proper divisors (284494063).

3129434561 is a wasteful number, since it uses less digits than its factorization.

3129434561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284494062.

The product of its digits is 77760, while the sum is 38.

The square root of 3129434561 is about 55941.3492954898. The cubic root of 3129434561 is about 1462.7001014442.

The spelling of 3129434561 in words is "three billion, one hundred twenty-nine million, four hundred thirty-four thousand, five hundred sixty-one".