51121339 has 2 divisors, whose sum is σ = 51121340. Its totient is φ = 51121338.

The previous prime is 51121337. The next prime is 51121361. The reversal of 51121339 is 93312115.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51121339 - 2¹ = 51121337 is a prime.

It is a super-2 number, since 2×51121339² = 5226782602305842, which contains 22 as substring.

Together with 51121337, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51121337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25560669 + 25560670.

It is an arithmetic number, because the mean of its divisors is an integer number (25560670).

Almost surely, 2^51121339 is an apocalyptic number.

51121339 is a deficient number, since it is larger than the sum of its proper divisors (1).

51121339 is an equidigital number, since it uses as much as digits as its factorization.

51121339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 810, while the sum is 25.

The square root of 51121339 is about 7149.9188107279. The cubic root of 51121339 is about 371.1368467106.

The spelling of 51121339 in words is "fifty-one million, one hundred twenty-one thousand, three hundred thirty-nine".