51448909 has 2 divisors, whose sum is σ = 51448910. Its totient is φ = 51448908.

The previous prime is 51448889. The next prime is 51448913. The reversal of 51448909 is 90984415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50552100 + 896809 = 7110^2 + 947^2 .

It is a cyclic number.

It is not a de Polignac number, because 51448909 - 2⁵ = 51448877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51448939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25724454 + 25724455.

It is an arithmetic number, because the mean of its divisors is an integer number (25724455).

Almost surely, 2^51448909 is an apocalyptic number.

It is an amenable number.

51448909 is a deficient number, since it is larger than the sum of its proper divisors (1).

51448909 is an equidigital number, since it uses as much as digits as its factorization.

51448909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 51448909 is about 7172.7894852700. The cubic root of 51448909 is about 371.9278702600.

The spelling of 51448909 in words is "fifty-one million, four hundred forty-eight thousand, nine hundred nine".