51629989 has 2 divisors, whose sum is σ = 51629990. Its totient is φ = 51629988.

The previous prime is 51629983. The next prime is 51630023. The reversal of 51629989 is 98992615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50268100 + 1361889 = 7090^2 + 1167^2 .

It is a cyclic number.

It is not a de Polignac number, because 51629989 - 2⁷ = 51629861 is a prime.

It is a super-3 number, since 3×51629989³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51629983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25814994 + 25814995.

It is an arithmetic number, because the mean of its divisors is an integer number (25814995).

Almost surely, 2^51629989 is an apocalyptic number.

It is an amenable number.

51629989 is a deficient number, since it is larger than the sum of its proper divisors (1).

51629989 is an equidigital number, since it uses as much as digits as its factorization.

51629989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 49.

The square root of 51629989 is about 7185.4011022350. The cubic root of 51629989 is about 372.3637061245.

It can be divided in two parts, 5162 and 9989, that added together give a palindrome (15151).

The spelling of 51629989 in words is "fifty-one million, six hundred twenty-nine thousand, nine hundred eighty-nine".