29690391481 has 9 divisors (see below), whose sum is σ = 30521075949. Its totient is φ = 28881745344.

The previous prime is 29690391473. The next prime is 29690391491. The reversal of 29690391481 is 18419309692.

The square root of 29690391481 is 172309.

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

It can be written as a sum of positive squares in 4 ways, for example, as 16883881 + 29673507600 = 4109^2 + 172260^2 .

It is not a de Polignac number, because 29690391481 - 2³ = 29690391473 is a prime.

It is a super-2 number, since 2×29690391481² (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 (29690391461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6373105 + ... + 6377761.

It is an arithmetic number, because the mean of its divisors is an integer number (3391230661).

Almost surely, 2^29690391481 is an apocalyptic number.

29690391481 is the 172309-th square number.

29690391481 is the 86155-th centered octagonal number.

It is an amenable number.

29690391481 is a deficient number, since it is larger than the sum of its proper divisors (830684468).

29690391481 is an frugal number, since it uses more digits than its factorization.

29690391481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9388 (or 4694 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 52.

The spelling of 29690391481 in words is "twenty-nine billion, six hundred ninety million, three hundred ninety-one thousand, four hundred eighty-one".