51440371 has 2 divisors, whose sum is σ = 51440372. Its totient is φ = 51440370.

The previous prime is 51440359. The next prime is 51440383. The reversal of 51440371 is 17304415.

It is a balanced prime because it is at equal distance from previous prime (51440359) and next prime (51440383).

It is a cyclic number.

It is not a de Polignac number, because 51440371 - 2¹⁷ = 51309299 is a prime.

It is a super-2 number, since 2×51440371² = 5292223537235282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51440071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25720185 + 25720186.

It is an arithmetic number, because the mean of its divisors is an integer number (25720186).

Almost surely, 2^51440371 is an apocalyptic number.

51440371 is a deficient number, since it is larger than the sum of its proper divisors (1).

51440371 is an equidigital number, since it uses as much as digits as its factorization.

51440371 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 51440371 is about 7172.1942946354. The cubic root of 51440371 is about 371.9072951827.

Adding to 51440371 its reverse (17304415), we get a palindrome (68744786).

The spelling of 51440371 in words is "fifty-one million, four hundred forty thousand, three hundred seventy-one".