51585397 has 2 divisors, whose sum is σ = 51585398. Its totient is φ = 51585396.

The previous prime is 51585383. The next prime is 51585419. The reversal of 51585397 is 79358515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45077796 + 6507601 = 6714^2 + 2551^2 .

It is a cyclic number.

It is not a de Polignac number, because 51585397 - 2¹⁵ = 51552629 is a prime.

It is a super-2 number, since 2×51585397² = 5322106367295218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51585307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25792698 + 25792699.

It is an arithmetic number, because the mean of its divisors is an integer number (25792699).

Almost surely, 2^51585397 is an apocalyptic number.

It is an amenable number.

51585397 is a deficient number, since it is larger than the sum of its proper divisors (1).

51585397 is an equidigital number, since it uses as much as digits as its factorization.

51585397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 189000, while the sum is 43.

The square root of 51585397 is about 7182.2974736501. The cubic root of 51585397 is about 372.2564737109.

The spelling of 51585397 in words is "fifty-one million, five hundred eighty-five thousand, three hundred ninety-seven".