51311401 has 2 divisors, whose sum is σ = 51311402. Its totient is φ = 51311400.

The previous prime is 51311399. The next prime is 51311441. The reversal of 51311401 is 10411315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44235801 + 7075600 = 6651^2 + 2660^2 .

It is a cyclic number.

It is not a de Polignac number, because 51311401 - 2¹ = 51311399 is a prime.

Together with 51311399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51311441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25655700 + 25655701.

It is an arithmetic number, because the mean of its divisors is an integer number (25655701).

Almost surely, 2^51311401 is an apocalyptic number.

It is an amenable number.

51311401 is a deficient number, since it is larger than the sum of its proper divisors (1).

51311401 is an equidigital number, since it uses as much as digits as its factorization.

51311401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 51311401 is about 7163.1976798075. The cubic root of 51311401 is about 371.5962228718.

Adding to 51311401 its reverse (10411315), we get a palindrome (61722716).

The spelling of 51311401 in words is "fifty-one million, three hundred eleven thousand, four hundred one".