51451619 has 2 divisors, whose sum is σ = 51451620. Its totient is φ = 51451618.

The previous prime is 51451577. The next prime is 51451627. The reversal of 51451619 is 91615415.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51451619 is a prime.

It is a super-2 number, since 2×51451619² = 5294538195442322, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (51451669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25725809 + 25725810.

It is an arithmetic number, because the mean of its divisors is an integer number (25725810).

Almost surely, 2^51451619 is an apocalyptic number.

51451619 is a deficient number, since it is larger than the sum of its proper divisors (1).

51451619 is an equidigital number, since it uses as much as digits as its factorization.

51451619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 32.

The square root of 51451619 is about 7172.9783911566. The cubic root of 51451619 is about 371.9344004071.

The spelling of 51451619 in words is "fifty-one million, four hundred fifty-one thousand, six hundred nineteen".