29931796961281 has 16 divisors (see below), whose sum is σ = 30377729341440. Its totient is φ = 29487549808080.

The previous prime is 29931796961273. The next prime is 29931796961299. The reversal of 29931796961281 is 18216969713992.

It is a cyclic number.

It is not a de Polignac number, because 29931796961281 - 2³ = 29931796961273 is a prime.

It is a super-2 number, since 2×29931796961281² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29931796961681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 949868316 + ... + 949899826.

It is an arithmetic number, because the mean of its divisors is an integer number (1898608083840).

Almost surely, 2^{29931796961281} is an apocalyptic number.

It is an amenable number.

29931796961281 is a deficient number, since it is larger than the sum of its proper divisors (445932380159).

29931796961281 is a wasteful number, since it uses less digits than its factorization.

29931796961281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57804.

The product of its digits is 158723712, while the sum is 73.

The spelling of 29931796961281 in words is "twenty-nine trillion, nine hundred thirty-one billion, seven hundred ninety-six million, nine hundred sixty-one thousand, two hundred eighty-one".