51291026 has 4 divisors (see below), whose sum is σ = 76936542. Its totient is φ = 25645512.

The previous prime is 51291017. The next prime is 51291029. The reversal of 51291026 is 62019215.

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., 47623801 + 3667225 = 6901^2 + 1915^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51290986 and 51291004.

It is not an unprimeable number, because it can be changed into a prime (51291029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12822755 + ... + 12822758.

Almost surely, 2^51291026 is an apocalyptic number.

51291026 is a deficient number, since it is larger than the sum of its proper divisors (25645516).

51291026 is a wasteful number, since it uses less digits than its factorization.

51291026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25645515.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 51291026 is about 7161.7753385596. The cubic root of 51291026 is about 371.5470312350.

The spelling of 51291026 in words is "fifty-one million, two hundred ninety-one thousand, twenty-six".