51497269 has 4 divisors (see below), whose sum is σ = 52075980. Its totient is φ = 50918560.

The previous prime is 51497263. The next prime is 51497309. The reversal of 51497269 is 96279415.

It is a happy number.

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 5121169 + 46376100 = 2263^2 + 6810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51497269 is a prime.

It is a super-2 number, since 2×51497269² = 5303937428916722, 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 (51497263) 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, 289222 + ... + 289399.

It is an arithmetic number, because the mean of its divisors is an integer number (13018995).

Almost surely, 2^51497269 is an apocalyptic number.

It is an amenable number.

51497269 is a deficient number, since it is larger than the sum of its proper divisors (578711).

51497269 is an equidigital number, since it uses as much as digits as its factorization.

51497269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578710.

The product of its digits is 136080, while the sum is 43.

The square root of 51497269 is about 7176.1597668948. The cubic root of 51497269 is about 372.0443664085.

The spelling of 51497269 in words is "fifty-one million, four hundred ninety-seven thousand, two hundred sixty-nine".