654691421 has 2 divisors, whose sum is σ = 654691422. Its totient is φ = 654691420.

The previous prime is 654691409. The next prime is 654691451. The reversal of 654691421 is 124196456.

654691421 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., 635594521 + 19096900 = 25211^2 + 4370^2 .

It is a cyclic number.

It is not a de Polignac number, because 654691421 - 2²² = 650497117 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (654691451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327345710 + 327345711.

It is an arithmetic number, because the mean of its divisors is an integer number (327345711).

Almost surely, 2^654691421 is an apocalyptic number.

It is an amenable number.

654691421 is a deficient number, since it is larger than the sum of its proper divisors (1).

654691421 is an equidigital number, since it uses as much as digits as its factorization.

654691421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 654691421 is about 25586.9384843127. The cubic root of 654691421 is about 868.3181587782.

The spelling of 654691421 in words is "six hundred fifty-four million, six hundred ninety-one thousand, four hundred twenty-one".