68631421 has 6 divisors (see below), whose sum is σ = 70124990. Its totient is φ = 67169016.

The previous prime is 68631413. The next prime is 68631443. The reversal of 68631421 is 12413686.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 60140025 + 8491396 = 7755^2 + 2914^2 .

It is not a de Polignac number, because 68631421 - 2³ = 68631413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68631481) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13326 + ... + 17743.

Almost surely, 2^68631421 is an apocalyptic number.

It is an amenable number.

68631421 is a deficient number, since it is larger than the sum of its proper divisors (1493569).

68631421 is an equidigital number, since it uses as much as digits as its factorization.

68631421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31163 (or 31116 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 68631421 is about 8284.4083071756. The cubic root of 68631421 is about 409.4249741917.

The spelling of 68631421 in words is "sixty-eight million, six hundred thirty-one thousand, four hundred twenty-one".