51261031 has 8 divisors (see below), whose sum is σ = 55214720. Its totient is φ = 47432952.

The previous prime is 51261019. The next prime is 51261047. The reversal of 51261031 is 13016215.

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 51261031 - 2⁷ = 51260903 is a prime.

It is a super-2 number, since 2×51261031² = 5255386598365922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51261061) 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, 30555 + ... + 32188.

It is an arithmetic number, because the mean of its divisors is an integer number (6901840).

Almost surely, 2^51261031 is an apocalyptic number.

51261031 is a deficient number, since it is larger than the sum of its proper divisors (3953689).

51261031 is a wasteful number, since it uses less digits than its factorization.

51261031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62805.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 51261031 is about 7159.6809286448. The cubic root of 51261031 is about 371.4745901914.

Adding to 51261031 its reverse (13016215), we get a palindrome (64277246).

The spelling of 51261031 in words is "fifty-one million, two hundred sixty-one thousand, thirty-one".