51909346 has 4 divisors (see below), whose sum is σ = 77864022. Its totient is φ = 25954672.

The previous prime is 51909343. The next prime is 51909359. The reversal of 51909346 is 64390915.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 39200121 + 12709225 = 6261^2 + 3565^2 .

It is not an unprimeable number, because it can be changed into a prime (51909343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12977335 + ... + 12977338.

Almost surely, 2^51909346 is an apocalyptic number.

51909346 is a deficient number, since it is larger than the sum of its proper divisors (25954676).

51909346 is a wasteful number, since it uses less digits than its factorization.

51909346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25954675.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 51909346 is about 7204.8140850406. The cubic root of 51909346 is about 373.0340875488.

The spelling of 51909346 in words is "fifty-one million, nine hundred nine thousand, three hundred forty-six".