4951921091 has 16 divisors (see below), whose sum is σ = 5579986944. Its totient is φ = 4360254624.

The previous prime is 4951921067. The next prime is 4951921099. The reversal of 4951921091 is 1901291594.

It is a happy number.

It is not a de Polignac number, because 4951921091 - 2⁶ = 4951921027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4951921099) 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, 87170 + ... + 132296.

It is an arithmetic number, because the mean of its divisors is an integer number (348749184).

Almost surely, 2^4951921091 is an apocalyptic number.

4951921091 is a deficient number, since it is larger than the sum of its proper divisors (628065853).

4951921091 is a wasteful number, since it uses less digits than its factorization.

4951921091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45530.

The product of its (nonzero) digits is 29160, while the sum is 41.

The square root of 4951921091 is about 70369.8876722139. The cubic root of 4951921091 is about 1704.4773659209.

The spelling of 4951921091 in words is "four billion, nine hundred fifty-one million, nine hundred twenty-one thousand, ninety-one".