68212251 has 6 divisors (see below), whose sum is σ = 98528820. Its totient is φ = 45474828.

The previous prime is 68212241. The next prime is 68212253. The reversal of 68212251 is 15221286.

It is a happy number.

It is not a de Polignac number, because 68212251 - 2⁹ = 68211739 is a prime.

It is a super-2 number, since 2×68212251² = 9305822372974002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68212253) 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 in 5 ways as a sum of consecutive naturals, for example, 3789561 + ... + 3789578.

It is an arithmetic number, because the mean of its divisors is an integer number (16421470).

Almost surely, 2^68212251 is an apocalyptic number.

68212251 is a deficient number, since it is larger than the sum of its proper divisors (30316569).

68212251 is a wasteful number, since it uses less digits than its factorization.

68212251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7579145 (or 7579142 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 68212251 is about 8259.0708315161. The cubic root of 68212251 is about 408.5897433102.

The spelling of 68212251 in words is "sixty-eight million, two hundred twelve thousand, two hundred fifty-one".