51174989 has 2 divisors, whose sum is σ = 51174990. Its totient is φ = 51174988.

The previous prime is 51174943. The next prime is 51175009. The reversal of 51174989 is 98947115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50055625 + 1119364 = 7075^2 + 1058^2 .

It is a cyclic number.

It is not a de Polignac number, because 51174989 - 2¹² = 51170893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51174089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25587494 + 25587495.

It is an arithmetic number, because the mean of its divisors is an integer number (25587495).

Almost surely, 2^51174989 is an apocalyptic number.

It is an amenable number.

51174989 is a deficient number, since it is larger than the sum of its proper divisors (1).

51174989 is an equidigital number, since it uses as much as digits as its factorization.

51174989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 44.

The square root of 51174989 is about 7153.6696177556. The cubic root of 51174989 is about 371.2666328938.

The spelling of 51174989 in words is "fifty-one million, one hundred seventy-four thousand, nine hundred eighty-nine".