51391426 has 8 divisors (see below), whose sum is σ = 77850684. Its totient is φ = 25441200.

The previous prime is 51391421. The next prime is 51391427. The reversal of 51391426 is 62419315.

It can be written as a sum of positive squares in 2 ways, for example, as 49688401 + 1703025 = 7049^2 + 1305^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (51391421) 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, 127005 + ... + 127408.

Almost surely, 2^51391426 is an apocalyptic number.

51391426 is a deficient number, since it is larger than the sum of its proper divisors (26459258).

51391426 is a wasteful number, since it uses less digits than its factorization.

51391426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254516.

The product of its digits is 6480, while the sum is 31.

The square root of 51391426 is about 7168.7813469236. The cubic root of 51391426 is about 371.7893023910.

The spelling of 51391426 in words is "fifty-one million, three hundred ninety-one thousand, four hundred twenty-six".