51381437 has 2 divisors, whose sum is σ = 51381438. Its totient is φ = 51381436.

The previous prime is 51381397. The next prime is 51381469. The reversal of 51381437 is 73418315.

It is an a-pointer prime, because the next prime (51381469) can be obtained adding 51381437 to its sum of digits (32).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47141956 + 4239481 = 6866^2 + 2059^2 .

It is a cyclic number.

It is not a de Polignac number, because 51381437 - 2⁶ = 51381373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51381137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25690718 + 25690719.

It is an arithmetic number, because the mean of its divisors is an integer number (25690719).

Almost surely, 2^51381437 is an apocalyptic number.

It is an amenable number.

51381437 is a deficient number, since it is larger than the sum of its proper divisors (1).

51381437 is an equidigital number, since it uses as much as digits as its factorization.

51381437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 32.

The square root of 51381437 is about 7168.0846116658. The cubic root of 51381437 is about 371.7652124842.

The spelling of 51381437 in words is "fifty-one million, three hundred eighty-one thousand, four hundred thirty-seven".