51026869 has 4 divisors (see below), whose sum is σ = 51321996. Its totient is φ = 50731744.

The previous prime is 51026867. The next prime is 51026873. The reversal of 51026869 is 96862015.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27144100 + 23882769 = 5210^2 + 4887^2 .

It is a cyclic number.

It is not a de Polignac number, because 51026869 - 2¹ = 51026867 is a prime.

It is a super-2 number, since 2×51026869² = 5207482719886322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51026867) 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, 147304 + ... + 147649.

It is an arithmetic number, because the mean of its divisors is an integer number (12830499).

Almost surely, 2^51026869 is an apocalyptic number.

It is an amenable number.

51026869 is a deficient number, since it is larger than the sum of its proper divisors (295127).

51026869 is a wasteful number, since it uses less digits than its factorization.

51026869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295126.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 51026869 is about 7143.3093871118. The cubic root of 51026869 is about 370.9080908521.

The spelling of 51026869 in words is "fifty-one million, twenty-six thousand, eight hundred sixty-nine".