51172663 has 2 divisors, whose sum is σ = 51172664. Its totient is φ = 51172662.

The previous prime is 51172621. The next prime is 51172679. The reversal of 51172663 is 36627115.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51172663 - 2¹³ = 51164471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51173663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25586331 + 25586332.

It is an arithmetic number, because the mean of its divisors is an integer number (25586332).

Almost surely, 2^51172663 is an apocalyptic number.

51172663 is a deficient number, since it is larger than the sum of its proper divisors (1).

51172663 is an equidigital number, since it uses as much as digits as its factorization.

51172663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 31.

The square root of 51172663 is about 7153.5070420039. The cubic root of 51172663 is about 371.2610078852.

Adding to 51172663 its reverse (36627115), we get a palindrome (87799778).

The spelling of 51172663 in words is "fifty-one million, one hundred seventy-two thousand, six hundred sixty-three".