51097311 has 12 divisors (see below), whose sum is σ = 76541192. Its totient is φ = 34064712.

The previous prime is 51097309. The next prime is 51097339. The reversal of 51097311 is 11379015.

It is a happy number.

It is not a de Polignac number, because 51097311 - 2¹ = 51097309 is a prime.

It is a super-2 number, since 2×51097311² = 5221870382861442, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51097381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104896 + ... + 105381.

Almost surely, 2^51097311 is an apocalyptic number.

51097311 is a deficient number, since it is larger than the sum of its proper divisors (25443881).

51097311 is an equidigital number, since it uses as much as digits as its factorization.

51097311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210292 (or 210280 counting only the distinct ones).

The product of its (nonzero) digits is 945, while the sum is 27.

The square root of 51097311 is about 7148.2383144380. The cubic root of 51097311 is about 371.0786904764.

The spelling of 51097311 in words is "fifty-one million, ninety-seven thousand, three hundred eleven".