5161151021 has 4 divisors (see below), whose sum is σ = 5558162652. Its totient is φ = 4764139392.

The previous prime is 5161151011. The next prime is 5161151041. The reversal of 5161151021 is 1201511615.

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

It can be written as a sum of positive squares in 2 ways, for example, as 997675396 + 4163475625 = 31586^2 + 64525^2 .

It is a cyclic number.

It is not a de Polignac number, because 5161151021 - 2¹⁰ = 5161149997 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 (5161151011) 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, 198505796 + ... + 198505821.

It is an arithmetic number, because the mean of its divisors is an integer number (1389540663).

Almost surely, 2^5161151021 is an apocalyptic number.

It is an amenable number.

5161151021 is a deficient number, since it is larger than the sum of its proper divisors (397011631).

5161151021 is a wasteful number, since it uses less digits than its factorization.

5161151021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397011630.

The product of its (nonzero) digits is 300, while the sum is 23.

The square root of 5161151021 is about 71841.1513061978. The cubic root of 5161151021 is about 1728.1529978780.

Adding to 5161151021 its reverse (1201511615), we get a palindrome (6362662636).

The spelling of 5161151021 in words is "five billion, one hundred sixty-one million, one hundred fifty-one thousand, twenty-one".