51201394 has 4 divisors (see below), whose sum is σ = 76802094. Its totient is φ = 25600696.

The previous prime is 51201389. The next prime is 51201407. The reversal of 51201394 is 49310215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49310215 = 5 ⋅9862043.

It can be written as a sum of positive squares in only one way, i.e., 47100769 + 4100625 = 6863^2 + 2025^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12800347 + ... + 12800350.

Almost surely, 2^51201394 is an apocalyptic number.

51201394 is a deficient number, since it is larger than the sum of its proper divisors (25600700).

51201394 is a wasteful number, since it uses less digits than its factorization.

51201394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25600699.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 51201394 is about 7155.5149360476. The cubic root of 51201394 is about 371.3304766453.

The spelling of 51201394 in words is "fifty-one million, two hundred one thousand, three hundred ninety-four".