4921555391 has 16 divisors (see below), whose sum is σ = 5037233280. Its totient is φ = 4807434240.

The previous prime is 4921555367. The next prime is 4921555399. The reversal of 4921555391 is 1935551294.

It is a cyclic number.

It is not a de Polignac number, because 4921555391 - 2¹⁰ = 4921554367 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 (4921555399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3817475 + ... + 3818763.

It is an arithmetic number, because the mean of its divisors is an integer number (314827080).

Almost surely, 2^4921555391 is an apocalyptic number.

4921555391 is a deficient number, since it is larger than the sum of its proper divisors (115677889).

4921555391 is a wasteful number, since it uses less digits than its factorization.

4921555391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826.

The product of its digits is 243000, while the sum is 44.

The square root of 4921555391 is about 70153.7981224110. The cubic root of 4921555391 is about 1700.9862087361.

The spelling of 4921555391 in words is "four billion, nine hundred twenty-one million, five hundred fifty-five thousand, three hundred ninety-one".