4991017637 has 4 divisors (see below), whose sum is σ = 4991426016. Its totient is φ = 4990609260.

The previous prime is 4991017631. The next prime is 4991017643. The reversal of 4991017637 is 7367101994.

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 an interprime number because it is at equal distance from previous prime (4991017631) and next prime (4991017643).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4991017637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4991017591 and 4991017600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4991017631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185273 + ... + 210494.

It is an arithmetic number, because the mean of its divisors is an integer number (1247856504).

Almost surely, 2^4991017637 is an apocalyptic number.

It is an amenable number.

4991017637 is a deficient number, since it is larger than the sum of its proper divisors (408379).

4991017637 is a wasteful number, since it uses less digits than its factorization.

4991017637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408378.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 4991017637 is about 70647.1346694259. The cubic root of 4991017637 is about 1708.9513579047.

The spelling of 4991017637 in words is "four billion, nine hundred ninety-one million, seventeen thousand, six hundred thirty-seven".