2150191581 has 4 divisors (see below), whose sum is σ = 2866922112. Its totient is φ = 1433461052.

The previous prime is 2150191559. The next prime is 2150191583. The reversal of 2150191581 is 1851910512.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2150191581 - 2⁷ = 2150191453 is a prime.

It is a super-2 number, since 2×2150191581² = 9246647670006559122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2150191583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358365261 + ... + 358365266.

It is an arithmetic number, because the mean of its divisors is an integer number (716730528).

Almost surely, 2^2150191581 is an apocalyptic number.

It is an amenable number.

2150191581 is a deficient number, since it is larger than the sum of its proper divisors (716730531).

2150191581 is an equidigital number, since it uses as much as digits as its factorization.

2150191581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716730530.

The product of its (nonzero) digits is 3600, while the sum is 33.

The square root of 2150191581 is about 46370.1583025118. The cubic root of 2150191581 is about 1290.7012154246.

The spelling of 2150191581 in words is "two billion, one hundred fifty million, one hundred ninety-one thousand, five hundred eighty-one".