51911797 has 4 divisors (see below), whose sum is σ = 59327776. Its totient is φ = 44495820.

The previous prime is 51911791. The next prime is 51911803. The reversal of 51911797 is 79711915.

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 an interprime number because it is at equal distance from previous prime (51911791) and next prime (51911803).

It is a cyclic number.

It is not a de Polignac number, because 51911797 - 2¹⁹ = 51387509 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 (51911791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3707979 + ... + 3707992.

It is an arithmetic number, because the mean of its divisors is an integer number (14831944).

Almost surely, 2^51911797 is an apocalyptic number.

It is an amenable number.

51911797 is a deficient number, since it is larger than the sum of its proper divisors (7415979).

51911797 is an equidigital number, since it uses as much as digits as its factorization.

51911797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7415978.

The product of its digits is 19845, while the sum is 40.

The square root of 51911797 is about 7204.9841776370. The cubic root of 51911797 is about 373.0399586313.

The spelling of 51911797 in words is "fifty-one million, nine hundred eleven thousand, seven hundred ninety-seven".