51215419 has 2 divisors, whose sum is σ = 51215420. Its totient is φ = 51215418.

The previous prime is 51215377. The next prime is 51215429. The reversal of 51215419 is 91451215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51215419 - 2⁷ = 51215291 is a prime.

It is a super-2 number, since 2×51215419² = 5246038286691122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51215429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25607709 + 25607710.

It is an arithmetic number, because the mean of its divisors is an integer number (25607710).

Almost surely, 2^51215419 is an apocalyptic number.

51215419 is a deficient number, since it is larger than the sum of its proper divisors (1).

51215419 is an equidigital number, since it uses as much as digits as its factorization.

51215419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 28.

The square root of 51215419 is about 7156.4948822730. The cubic root of 51215419 is about 371.3643782906.

It can be divided in two parts, 512 and 15419, that added together give a triangular number (15931 = T₁₇₈).

The spelling of 51215419 in words is "fifty-one million, two hundred fifteen thousand, four hundred nineteen".