51997349 has 4 divisors (see below), whose sum is σ = 52878720. Its totient is φ = 51115980.

The previous prime is 51997333. The next prime is 51997381. The reversal of 51997349 is 94379915.

51997349 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 51997349 - 2⁴ = 51997333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51997249) 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, 440597 + ... + 440714.

It is an arithmetic number, because the mean of its divisors is an integer number (13219680).

Almost surely, 2^51997349 is an apocalyptic number.

51997349 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

It is an amenable number.

51997349 is a deficient number, since it is larger than the sum of its proper divisors (881371).

51997349 is an equidigital number, since it uses as much as digits as its factorization.

51997349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881370.

The product of its digits is 306180, while the sum is 47.

The square root of 51997349 is about 7210.9187348077. The cubic root of 51997349 is about 373.2447726976.

The spelling of 51997349 in words is "fifty-one million, nine hundred ninety-seven thousand, three hundred forty-nine".