2291991154 has 4 divisors (see below), whose sum is σ = 3437986734. Its totient is φ = 1145995576.

The previous prime is 2291991151. The next prime is 2291991161. The reversal of 2291991154 is 4511991922.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1429218025 + 862773129 = 37805^2 + 29373^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2291991154.

It is not an unprimeable number, because it can be changed into a prime (2291991151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572997787 + ... + 572997790.

Almost surely, 2^2291991154 is an apocalyptic number.

2291991154 is a deficient number, since it is larger than the sum of its proper divisors (1145995580).

2291991154 is a wasteful number, since it uses less digits than its factorization.

2291991154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145995579.

The product of its digits is 58320, while the sum is 43.

The square root of 2291991154 is about 47874.7444275163. The cubic root of 2291991154 is about 1318.4722058295.

The spelling of 2291991154 in words is "two billion, two hundred ninety-one million, nine hundred ninety-one thousand, one hundred fifty-four".