51581426 has 16 divisors (see below), whose sum is σ = 83487768. Its totient is φ = 23760000.

The previous prime is 51581423. The next prime is 51581443. The reversal of 51581426 is 62418515.

It can be written as a sum of positive squares in 4 ways, for example, as 37149025 + 14432401 = 6095^2 + 3799^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51581392 and 51581401.

It is not an unprimeable number, because it can be changed into a prime (51581423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13976 + ... + 17276.

Almost surely, 2^51581426 is an apocalyptic number.

51581426 is a deficient number, since it is larger than the sum of its proper divisors (31906342).

51581426 is a wasteful number, since it uses less digits than its factorization.

51581426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3917.

The product of its digits is 9600, while the sum is 32.

The square root of 51581426 is about 7182.0210247534. The cubic root of 51581426 is about 372.2469214702.

The spelling of 51581426 in words is "fifty-one million, five hundred eighty-one thousand, four hundred twenty-six".