421470661 has 2 divisors, whose sum is σ = 421470662. Its totient is φ = 421470660.

The previous prime is 421470631. The next prime is 421470701. The reversal of 421470661 is 166074124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 420045025 + 1425636 = 20495^2 + 1194^2 .

It is a cyclic number.

It is not a de Polignac number, because 421470661 - 2⁵ = 421470629 is a prime.

It is equal to p_22418608 and since 421470661 and 22418608 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421470631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210735330 + 210735331.

It is an arithmetic number, because the mean of its divisors is an integer number (210735331).

Almost surely, 2^421470661 is an apocalyptic number.

It is an amenable number.

421470661 is a deficient number, since it is larger than the sum of its proper divisors (1).

421470661 is an equidigital number, since it uses as much as digits as its factorization.

421470661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 421470661 is about 20529.7506317052. The cubic root of 421470661 is about 749.7603151134.

The spelling of 421470661 in words is "four hundred twenty-one million, four hundred seventy thousand, six hundred sixty-one".