51281601 has 16 divisors (see below), whose sum is σ = 78440448. Its totient is φ = 29192400.

The previous prime is 51281597. The next prime is 51281621. The reversal of 51281601 is 10618215.

It is not a de Polignac number, because 51281601 - 2² = 51281597 is a prime.

It is a super-2 number, since 2×51281601² = 5259605202246402, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51281621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1186 + ... + 10196.

It is an arithmetic number, because the mean of its divisors is an integer number (4902528).

Almost surely, 2^51281601 is an apocalyptic number.

It is an amenable number.

51281601 is a deficient number, since it is larger than the sum of its proper divisors (27158847).

51281601 is a wasteful number, since it uses less digits than its factorization.

51281601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9292.

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 51281601 is about 7161.1173010921. The cubic root of 51281601 is about 371.5242719237.

Adding to 51281601 its reverse (10618215), we get a palindrome (61899816).

The spelling of 51281601 in words is "fifty-one million, two hundred eighty-one thousand, six hundred one".