51618019 has 2 divisors, whose sum is σ = 51618020. Its totient is φ = 51618018.

The previous prime is 51618011. The next prime is 51618023. The reversal of 51618019 is 91081615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51618019 - 2³ = 51618011 is a prime.

It is a super-2 number, since 2×51618019² = 5328839770968722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51618011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25809009 + 25809010.

It is an arithmetic number, because the mean of its divisors is an integer number (25809010).

Almost surely, 2^51618019 is an apocalyptic number.

51618019 is a deficient number, since it is larger than the sum of its proper divisors (1).

51618019 is an equidigital number, since it uses as much as digits as its factorization.

51618019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 51618019 is about 7184.5681150644. The cubic root of 51618019 is about 372.3349273847.

The spelling of 51618019 in words is "fifty-one million, six hundred eighteen thousand, nineteen".