4129991 has 8 divisors (see below), whose sum is σ = 4221984. Its totient is φ = 4039200.

The previous prime is 4129987. The next prime is 4130003. The reversal of 4129991 is 1999214.

4129991 = 26² + 27² + ... + 231².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4129991 - 2² = 4129987 is a prime.

It is a super-3 number, since 3×4129991³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4129921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10205 + ... + 10601.

It is an arithmetic number, because the mean of its divisors is an integer number (527748).

Almost surely, 2^4129991 is an apocalyptic number.

4129991 is a deficient number, since it is larger than the sum of its proper divisors (91993).

4129991 is a wasteful number, since it uses less digits than its factorization.

4129991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601.

The product of its digits is 5832, while the sum is 35.

The square root of 4129991 is about 2032.2379289837. The cubic root of 4129991 is about 160.4413724659.

The spelling of 4129991 in words is "four million, one hundred twenty-nine thousand, nine hundred ninety-one".