29991481 has 32 divisors (see below), whose sum is σ = 36288000. Its totient is φ = 24530688.

The previous prime is 29991461. The next prime is 29991503. The reversal of 29991481 is 18419992.

It is a happy number.

It is not a de Polignac number, because 29991481 - 2¹⁵ = 29958713 is a prime.

It is a super-2 number, since 2×29991481² = 1798977865146722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29991461) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 379600 + ... + 379678.

It is an arithmetic number, because the mean of its divisors is an integer number (1134000).

Almost surely, 2^29991481 is an apocalyptic number.

It is an amenable number.

29991481 is a deficient number, since it is larger than the sum of its proper divisors (6296519).

29991481 is a wasteful number, since it uses less digits than its factorization.

29991481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193.

The product of its digits is 46656, while the sum is 43.

The square root of 29991481 is about 5476.4478450908. The cubic root of 29991481 is about 310.6938361291.

The spelling of 29991481 in words is "twenty-nine million, nine hundred ninety-one thousand, four hundred eighty-one".