51121541 has 4 divisors (see below), whose sum is σ = 51136812. Its totient is φ = 51106272.

The previous prime is 51121537. The next prime is 51121549. The reversal of 51121541 is 14512115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14512115 = 5 ⋅2902423.

It can be written as a sum of positive squares in 2 ways, for example, as 33016516 + 18105025 = 5746^2 + 4255^2 .

It is a cyclic number.

It is not a de Polignac number, because 51121541 - 2² = 51121537 is a prime.

It is a super-2 number, since 2×51121541² = 5226823908429362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51121549) 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, 200 + ... + 10113.

It is an arithmetic number, because the mean of its divisors is an integer number (12784203).

Almost surely, 2^51121541 is an apocalyptic number.

It is an amenable number.

51121541 is a deficient number, since it is larger than the sum of its proper divisors (15271).

51121541 is a wasteful number, since it uses less digits than its factorization.

51121541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15270.

The product of its digits is 200, while the sum is 20.

The square root of 51121541 is about 7149.9329367484. The cubic root of 51121541 is about 371.1373355445.

Adding to 51121541 its reverse (14512115), we get a palindrome (65633656).

The spelling of 51121541 in words is "fifty-one million, one hundred twenty-one thousand, five hundred forty-one".