29687845381 has 2 divisors, whose sum is σ = 29687845382. Its totient is φ = 29687845380.

The previous prime is 29687845333. The next prime is 29687845391. The reversal of 29687845381 is 18354878692.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23671361025 + 6016484356 = 153855^2 + 77566^2 .

It is a cyclic number.

It is not a de Polignac number, because 29687845381 - 2²⁹ = 29150974469 is a prime.

It is a super-2 number, since 2×29687845381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29687845391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14843922690 + 14843922691.

It is an arithmetic number, because the mean of its divisors is an integer number (14843922691).

Almost surely, 2^29687845381 is an apocalyptic number.

It is an amenable number.

29687845381 is a deficient number, since it is larger than the sum of its proper divisors (1).

29687845381 is an equidigital number, since it uses as much as digits as its factorization.

29687845381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23224320, while the sum is 61.

The spelling of 29687845381 in words is "twenty-nine billion, six hundred eighty-seven million, eight hundred forty-five thousand, three hundred eighty-one".