2991251409 has 8 divisors (see below), whose sum is σ = 4073193600. Its totient is φ = 1951738416.

The previous prime is 2991251401. The next prime is 2991251477. The reversal of 2991251409 is 9041521992.

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

It is not a de Polignac number, because 2991251409 - 2³ = 2991251401 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2991251401) 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, 10607134 + ... + 10607415.

It is an arithmetic number, because the mean of its divisors is an integer number (509149200).

Almost surely, 2^2991251409 is an apocalyptic number.

It is an amenable number.

2991251409 is a deficient number, since it is larger than the sum of its proper divisors (1081942191).

2991251409 is a wasteful number, since it uses less digits than its factorization.

2991251409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21214599.

The product of its (nonzero) digits is 58320, while the sum is 42.

The square root of 2991251409 is about 54692.3340972023. The cubic root of 2991251409 is about 1440.8462440067.

The spelling of 2991251409 in words is "two billion, nine hundred ninety-one million, two hundred fifty-one thousand, four hundred nine".