51474649 has 2 divisors, whose sum is σ = 51474650. Its totient is φ = 51474648.

The previous prime is 51474641. The next prime is 51474671. The reversal of 51474649 is 94647415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39778249 + 11696400 = 6307^2 + 3420^2 .

It is a cyclic number.

It is not a de Polignac number, because 51474649 - 2³ = 51474641 is a prime.

It is not a weakly prime, because it can be changed into another prime (51474641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25737324 + 25737325.

It is an arithmetic number, because the mean of its divisors is an integer number (25737325).

Almost surely, 2^51474649 is an apocalyptic number.

It is an amenable number.

51474649 is a deficient number, since it is larger than the sum of its proper divisors (1).

51474649 is an equidigital number, since it uses as much as digits as its factorization.

51474649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 51474649 is about 7174.5835419207. The cubic root of 51474649 is about 371.9898853572.

The spelling of 51474649 in words is "fifty-one million, four hundred seventy-four thousand, six hundred forty-nine".