51491119 has 2 divisors, whose sum is σ = 51491120. Its totient is φ = 51491118.

The previous prime is 51491101. The next prime is 51491149. The reversal of 51491119 is 91119415.

51491119 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51491119 - 2¹⁷ = 51360047 is a prime.

It is a super-2 number, since 2×51491119² = 5302670671744322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51491149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25745559 + 25745560.

It is an arithmetic number, because the mean of its divisors is an integer number (25745560).

Almost surely, 2^51491119 is an apocalyptic number.

51491119 is a deficient number, since it is larger than the sum of its proper divisors (1).

51491119 is an equidigital number, since it uses as much as digits as its factorization.

51491119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 31.

The square root of 51491119 is about 7175.7312519352. The cubic root of 51491119 is about 372.0295555004.

The spelling of 51491119 in words is "fifty-one million, four hundred ninety-one thousand, one hundred nineteen".