51480661 has 2 divisors, whose sum is σ = 51480662. Its totient is φ = 51480660.

The previous prime is 51480659. The next prime is 51480697. The reversal of 51480661 is 16608415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51480625 + 36 = 7175^2 + 6^2 .

It is a cyclic number.

It is not a de Polignac number, because 51480661 - 2¹ = 51480659 is a prime.

Together with 51480659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51483661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25740330 + 25740331.

It is an arithmetic number, because the mean of its divisors is an integer number (25740331).

Almost surely, 2^51480661 is an apocalyptic number.

It is an amenable number.

51480661 is a deficient number, since it is larger than the sum of its proper divisors (1).

51480661 is an equidigital number, since it uses as much as digits as its factorization.

51480661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 51480661 is about 7175.0025087104. The cubic root of 51480661 is about 372.0043670239.

The spelling of 51480661 in words is "fifty-one million, four hundred eighty thousand, six hundred sixty-one".