29191381 has 2 divisors, whose sum is σ = 29191382. Its totient is φ = 29191380.

The previous prime is 29191373. The next prime is 29191387. The reversal of 29191381 is 18319192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27772900 + 1418481 = 5270^2 + 1191^2 .

It is a cyclic number.

It is not a de Polignac number, because 29191381 - 2³ = 29191373 is a prime.

It is a super-2 number, since 2×29191381² = 1704273449374322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29191387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14595690 + 14595691.

It is an arithmetic number, because the mean of its divisors is an integer number (14595691).

Almost surely, 2^29191381 is an apocalyptic number.

It is an amenable number.

29191381 is a deficient number, since it is larger than the sum of its proper divisors (1).

29191381 is an equidigital number, since it uses as much as digits as its factorization.

29191381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 34.

The square root of 29191381 is about 5402.9048668286. The cubic root of 29191381 is about 307.9060438944.

The spelling of 29191381 in words is "twenty-nine million, one hundred ninety-one thousand, three hundred eighty-one".