51031031 has 2 divisors, whose sum is σ = 51031032. Its totient is φ = 51031030.

The previous prime is 51031007. The next prime is 51031073. The reversal of 51031031 is 13013015.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51031031 - 2¹⁴ = 51014647 is a prime.

It is a super-2 number, since 2×51031031² = 5208332249845922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 51030997 and 51031015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51031081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25515515 + 25515516.

It is an arithmetic number, because the mean of its divisors is an integer number (25515516).

Almost surely, 2^51031031 is an apocalyptic number.

51031031 is a deficient number, since it is larger than the sum of its proper divisors (1).

51031031 is an equidigital number, since it uses as much as digits as its factorization.

51031031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45, while the sum is 14.

The square root of 51031031 is about 7143.6007027269. The cubic root of 51031031 is about 370.9181749349.

Adding to 51031031 its reverse (13013015), we get a palindrome (64044046).

The spelling of 51031031 in words is "fifty-one million, thirty-one thousand, thirty-one".