51745397 has 4 divisors (see below), whose sum is σ = 56449536. Its totient is φ = 47041260.

The previous prime is 51745387. The next prime is 51745427. The reversal of 51745397 is 79354715.

51745397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51745397 - 2¹⁸ = 51483253 is a prime.

It is a super-2 number, since 2×51745397² = 5355172221375218, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51745357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2352053 + ... + 2352074.

It is an arithmetic number, because the mean of its divisors is an integer number (14112384).

Almost surely, 2^51745397 is an apocalyptic number.

It is an amenable number.

51745397 is a deficient number, since it is larger than the sum of its proper divisors (4704139).

51745397 is a wasteful number, since it uses less digits than its factorization.

51745397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4704138.

The product of its digits is 132300, while the sum is 41.

The square root of 51745397 is about 7193.4273472386. The cubic root of 51745397 is about 372.6409466168.

The spelling of 51745397 in words is "fifty-one million, seven hundred forty-five thousand, three hundred ninety-seven".