51909151 has 4 divisors (see below), whose sum is σ = 59324752. Its totient is φ = 44493552.

The previous prime is 51909131. The next prime is 51909167. The reversal of 51909151 is 15190915.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15190915 = 5 ⋅3038183.

It is a cyclic number.

It is not a de Polignac number, because 51909151 - 2²¹ = 49811999 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 (51909131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3707790 + ... + 3707803.

It is an arithmetic number, because the mean of its divisors is an integer number (14831188).

Almost surely, 2^51909151 is an apocalyptic number.

51909151 is a deficient number, since it is larger than the sum of its proper divisors (7415601).

51909151 is an equidigital number, since it uses as much as digits as its factorization.

51909151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7415600.

The product of its (nonzero) digits is 2025, while the sum is 31.

The square root of 51909151 is about 7204.8005524095. The cubic root of 51909151 is about 373.0336204413.

It can be divided in two parts, 5190 and 9151, that added together give a palindrome (14341).

The spelling of 51909151 in words is "fifty-one million, nine hundred nine thousand, one hundred fifty-one".