51957409 has 4 divisors (see below), whose sum is σ = 59379904. Its totient is φ = 44534916.

The previous prime is 51957407. The next prime is 51957413. The reversal of 51957409 is 90475915.

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 51957409 - 2¹ = 51957407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51957403) 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, 3711237 + ... + 3711250.

It is an arithmetic number, because the mean of its divisors is an integer number (14844976).

Almost surely, 2^51957409 is an apocalyptic number.

It is an amenable number.

51957409 is a deficient number, since it is larger than the sum of its proper divisors (7422495).

51957409 is an equidigital number, since it uses as much as digits as its factorization.

51957409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7422494.

The product of its (nonzero) digits is 56700, while the sum is 40.

The square root of 51957409 is about 7208.1487914721. The cubic root of 51957409 is about 373.1491831146.

The spelling of 51957409 in words is "fifty-one million, nine hundred fifty-seven thousand, four hundred nine".