5131065221 has 4 divisors (see below), whose sum is σ = 5207648352. Its totient is φ = 5054482092.

The previous prime is 5131065151. The next prime is 5131065227. The reversal of 5131065221 is 1225601315.

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 a cyclic number.

It is not a de Polignac number, because 5131065221 - 2¹⁸ = 5130803077 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 (5131065227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38291465 + ... + 38291598.

It is an arithmetic number, because the mean of its divisors is an integer number (1301912088).

Almost surely, 2^5131065221 is an apocalyptic number.

It is an amenable number.

5131065221 is a deficient number, since it is larger than the sum of its proper divisors (76583131).

5131065221 is an equidigital number, since it uses as much as digits as its factorization.

5131065221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76583130.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 5131065221 is about 71631.4541315475. The cubic root of 5131065221 is about 1724.7884886363.

Adding to 5131065221 its reverse (1225601315), we get a palindrome (6356666536).

The spelling of 5131065221 in words is "five billion, one hundred thirty-one million, sixty-five thousand, two hundred twenty-one".