4952251991 has 4 divisors (see below), whose sum is σ = 4971521712. Its totient is φ = 4932982272.

The previous prime is 4952251981. The next prime is 4952252033. The reversal of 4952251991 is 1991522594.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 4952251991 - 2²⁶ = 4885143127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4952251921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9634475 + ... + 9634988.

It is an arithmetic number, because the mean of its divisors is an integer number (1242880428).

Almost surely, 2^4952251991 is an apocalyptic number.

4952251991 is a deficient number, since it is larger than the sum of its proper divisors (19269721).

4952251991 is a wasteful number, since it uses less digits than its factorization.

4952251991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19269720.

The product of its digits is 291600, while the sum is 47.

The square root of 4952251991 is about 70372.2387806442. The cubic root of 4952251991 is about 1704.5153309173.

The spelling of 4952251991 in words is "four billion, nine hundred fifty-two million, two hundred fifty-one thousand, nine hundred ninety-one".