51231361 has 8 divisors (see below), whose sum is σ = 52534944. Its totient is φ = 49932960.

The previous prime is 51231331. The next prime is 51231377. The reversal of 51231361 is 16313215.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 51231361 - 2⁵ = 51231329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51231331) 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, 25566 + ... + 27496.

It is an arithmetic number, because the mean of its divisors is an integer number (6566868).

Almost surely, 2^51231361 is an apocalyptic number.

It is an amenable number.

51231361 is a deficient number, since it is larger than the sum of its proper divisors (1303583).

51231361 is a wasteful number, since it uses less digits than its factorization.

51231361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591.

The product of its digits is 540, while the sum is 22.

The square root of 51231361 is about 7157.6086090258. The cubic root of 51231361 is about 371.4029062500.

Adding to 51231361 its reverse (16313215), we get a palindrome (67544576).

The spelling of 51231361 in words is "fifty-one million, two hundred thirty-one thousand, three hundred sixty-one".