51001361 has 6 divisors (see below), whose sum is σ = 51642630. Its totient is φ = 50361696.

The previous prime is 51001303. The next prime is 51001367. The reversal of 51001361 is 16310015.

It can be written as a sum of positive squares in 3 ways, for example, as 5856400 + 45144961 = 2420^2 + 6719^2 .

It is not a de Polignac number, because 51001361 - 2⁶ = 51001297 is a prime.

It is a super-2 number, since 2×51001361² = 5202277647704642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51001367) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66995 + ... + 67751.

It is an arithmetic number, because the mean of its divisors is an integer number (8607105).

Almost surely, 2^51001361 is an apocalyptic number.

It is an amenable number.

51001361 is a deficient number, since it is larger than the sum of its proper divisors (641269).

51001361 is an frugal number, since it uses more digits than its factorization.

51001361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603 (or 846 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 51001361 is about 7141.5237169668. The cubic root of 51001361 is about 370.8462757031.

Adding to 51001361 its reverse (16310015), we get a palindrome (67311376).

The spelling of 51001361 in words is "fifty-one million, one thousand, three hundred sixty-one".