51611407 has 4 divisors (see below), whose sum is σ = 51626536. Its totient is φ = 51596280.

The previous prime is 51611393. The next prime is 51611423. The reversal of 51611407 is 70411615.

It is a happy number.

51611407 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 brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 70411615 = 5 ⋅14082323.

It is a cyclic number.

It is not a de Polignac number, because 51611407 - 2⁷ = 51611279 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 (51611477) 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, 232 + ... + 10162.

It is an arithmetic number, because the mean of its divisors is an integer number (12906634).

Almost surely, 2^51611407 is an apocalyptic number.

51611407 is a deficient number, since it is larger than the sum of its proper divisors (15129).

51611407 is an equidigital number, since it uses as much as digits as its factorization.

51611407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15128.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 51611407 is about 7184.1079474072. The cubic root of 51611407 is about 372.3190286494.

The spelling of 51611407 in words is "fifty-one million, six hundred eleven thousand, four hundred seven".