29226979681 has 9 divisors (see below), whose sum is σ = 30557078419. Its totient is φ = 27952480336.

The previous prime is 29226979679. The next prime is 29226979687. The reversal of 29226979681 is 18697962292.

The square root of 29226979681 is 170959.

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., 1742645025 + 27484334656 = 41745^2 + 165784^2 .

It is not a de Polignac number, because 29226979681 - 2¹ = 29226979679 is a prime.

It is a super-2 number, since 2×29226979681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29226979687) 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, 3928341 + ... + 3935773.

Almost surely, 2^29226979681 is an apocalyptic number.

29226979681 is the 170959-th square number.

29226979681 is the 85480-th centered octagonal number.

It is an amenable number.

29226979681 is a deficient number, since it is larger than the sum of its proper divisors (1330098738).

29226979681 is an frugal number, since it uses more digits than its factorization.

29226979681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14912 (or 7456 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 61.

The spelling of 29226979681 in words is "twenty-nine billion, two hundred twenty-six million, nine hundred seventy-nine thousand, six hundred eighty-one".