51290369 has 4 divisors (see below), whose sum is σ = 55235796. Its totient is φ = 47344944.

The previous prime is 51290363. The next prime is 51290381. The reversal of 51290369 is 96309215.

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 3168400 + 48121969 = 1780^2 + 6937^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51290369 is a prime.

It is a super-2 number, since 2×51290369² = 5261403904312322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51290363) 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, 1972694 + ... + 1972719.

It is an arithmetic number, because the mean of its divisors is an integer number (13808949).

Almost surely, 2^51290369 is an apocalyptic number.

It is an amenable number.

51290369 is a deficient number, since it is larger than the sum of its proper divisors (3945427).

51290369 is a wasteful number, since it uses less digits than its factorization.

51290369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3945426.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 51290369 is about 7161.7294698976. The cubic root of 51290369 is about 371.5454448143.

The spelling of 51290369 in words is "fifty-one million, two hundred ninety thousand, three hundred sixty-nine".