51267561 has 8 divisors (see below), whose sum is σ = 68392800. Its totient is φ = 34160352.

The previous prime is 51267547. The next prime is 51267571. The reversal of 51267561 is 16576215.

Added to its reverse (16576215) it gives a triangular number (67843776 = T₁₁₆₄₈).

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

It is not a de Polignac number, because 51267561 - 2⁹ = 51267049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51267571) 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, 4990 + ... + 11288.

It is an arithmetic number, because the mean of its divisors is an integer number (8549100).

Almost surely, 2^51267561 is an apocalyptic number.

It is an amenable number.

51267561 is a deficient number, since it is larger than the sum of its proper divisors (17125239).

51267561 is a wasteful number, since it uses less digits than its factorization.

51267561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9015.

The product of its digits is 12600, while the sum is 33.

The square root of 51267561 is about 7160.1369400312. The cubic root of 51267561 is about 371.4903632262.

Adding to 51267561 its reverse (16576215), we get a triangular number (67843776 = T₁₁₆₄₈).

The spelling of 51267561 in words is "fifty-one million, two hundred sixty-seven thousand, five hundred sixty-one".