51151091 has 2 divisors, whose sum is σ = 51151092. Its totient is φ = 51151090.

The previous prime is 51151073. The next prime is 51151109. The reversal of 51151091 is 19015115.

Together with next prime (51151109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (51151073) and next prime (51151109).

It is a cyclic number.

It is not a de Polignac number, because 51151091 - 2¹⁸ = 50888947 is a prime.

It is a super-2 number, since 2×51151091² = 5232868220980562, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51151031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25575545 + 25575546.

It is an arithmetic number, because the mean of its divisors is an integer number (25575546).

Almost surely, 2^51151091 is an apocalyptic number.

51151091 is a deficient number, since it is larger than the sum of its proper divisors (1).

51151091 is an equidigital number, since it uses as much as digits as its factorization.

51151091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225, while the sum is 23.

The square root of 51151091 is about 7151.9990911633. Note that the first 3 decimals coincide. The cubic root of 51151091 is about 371.2088317971.

The spelling of 51151091 in words is "fifty-one million, one hundred fifty-one thousand, ninety-one".