51451501 has 2 divisors, whose sum is σ = 51451502. Its totient is φ = 51451500.

The previous prime is 51451493. The next prime is 51451513. The reversal of 51451501 is 10515415.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44555625 + 6895876 = 6675^2 + 2626^2 .

It is a cyclic number.

It is not a de Polignac number, because 51451501 - 2³ = 51451493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51451541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25725750 + 25725751.

It is an arithmetic number, because the mean of its divisors is an integer number (25725751).

Almost surely, 2^51451501 is an apocalyptic number.

It is an amenable number.

51451501 is a deficient number, since it is larger than the sum of its proper divisors (1).

51451501 is an equidigital number, since it uses as much as digits as its factorization.

51451501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 51451501 is about 7172.9701658379. The cubic root of 51451501 is about 371.9341160733.

Adding to 51451501 its reverse (10515415), we get a palindrome (61966916).

The spelling of 51451501 in words is "fifty-one million, four hundred fifty-one thousand, five hundred one".