2991101657 has 4 divisors (see below), whose sum is σ = 3148528080. Its totient is φ = 2833675236.

The previous prime is 2991101611. The next prime is 2991101689. The reversal of 2991101657 is 7561011992.

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 2991101657 - 2¹² = 2991097561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2991101257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78713183 + ... + 78713220.

It is an arithmetic number, because the mean of its divisors is an integer number (787132020).

Almost surely, 2^2991101657 is an apocalyptic number.

It is an amenable number.

2991101657 is a deficient number, since it is larger than the sum of its proper divisors (157426423).

2991101657 is a wasteful number, since it uses less digits than its factorization.

2991101657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157426422.

The product of its (nonzero) digits is 34020, while the sum is 41.

The square root of 2991101657 is about 54690.9650399406. The cubic root of 2991101657 is about 1440.8221990862.

The spelling of 2991101657 in words is "two billion, nine hundred ninety-one million, one hundred one thousand, six hundred fifty-seven".