612687421 has 2 divisors, whose sum is σ = 612687422. Its totient is φ = 612687420.

The previous prime is 612687401. The next prime is 612687451. The reversal of 612687421 is 124786216.

612687421 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 can be written as a sum of positive squares in only one way, i.e., 390260025 + 222427396 = 19755^2 + 14914^2 .

It is a cyclic number.

It is not a de Polignac number, because 612687421 - 2⁹ = 612686909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (612687401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306343710 + 306343711.

It is an arithmetic number, because the mean of its divisors is an integer number (306343711).

Almost surely, 2^612687421 is an apocalyptic number.

It is an amenable number.

612687421 is a deficient number, since it is larger than the sum of its proper divisors (1).

612687421 is an equidigital number, since it uses as much as digits as its factorization.

612687421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 612687421 is about 24752.5235279153. The cubic root of 612687421 is about 849.3362389003.

The spelling of 612687421 in words is "six hundred twelve million, six hundred eighty-seven thousand, four hundred twenty-one".