5121561 has 8 divisors (see below), whose sum is σ = 6843424. Its totient is φ = 3407040.

The previous prime is 5121559. The next prime is 5121581. The reversal of 5121561 is 1651215.

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

It is not a de Polignac number, because 5121561 - 2¹ = 5121559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5121511) 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, 81 + ... + 3201.

It is an arithmetic number, because the mean of its divisors is an integer number (855428).

Almost surely, 2^5121561 is an apocalyptic number.

It is an amenable number.

5121561 is a deficient number, since it is larger than the sum of its proper divisors (1721863).

5121561 is a wasteful number, since it uses less digits than its factorization.

5121561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3671.

The product of its digits is 300, while the sum is 21.

The square root of 5121561 is about 2263.0866090364. The cubic root of 5121561 is about 172.3722894256.

Adding to 5121561 its reverse (1651215), we get a palindrome (6772776).

It can be divided in two parts, 51 and 21561, that added together give a palindrome (21612).

The spelling of 5121561 in words is "five million, one hundred twenty-one thousand, five hundred sixty-one".