5251121691 has 8 divisors (see below), whose sum is σ = 7006407744. Its totient is φ = 3498291720.

The previous prime is 5251121657. The next prime is 5251121693. The reversal of 5251121691 is 1961211525.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5251121691 - 2⁶ = 5251121627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5251121693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 609025 + ... + 617586.

It is an arithmetic number, because the mean of its divisors is an integer number (875800968).

Almost surely, 2^5251121691 is an apocalyptic number.

5251121691 is a deficient number, since it is larger than the sum of its proper divisors (1755286053).

5251121691 is a wasteful number, since it uses less digits than its factorization.

5251121691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228041.

The product of its digits is 5400, while the sum is 33.

The square root of 5251121691 is about 72464.6237208198. The cubic root of 5251121691 is about 1738.1370922894.

The spelling of 5251121691 in words is "five billion, two hundred fifty-one million, one hundred twenty-one thousand, six hundred ninety-one".