421446551 has 2 divisors, whose sum is σ = 421446552. Its totient is φ = 421446550.

The previous prime is 421446533. The next prime is 421446559. The reversal of 421446551 is 155644124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421446551 - 2²² = 417252247 is a prime.

It is a Chen prime.

It is equal to p_22417349 and since 421446551 and 22417349 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 (421446559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210723275 + 210723276.

It is an arithmetic number, because the mean of its divisors is an integer number (210723276).

Almost surely, 2^421446551 is an apocalyptic number.

421446551 is a deficient number, since it is larger than the sum of its proper divisors (1).

421446551 is an equidigital number, since it uses as much as digits as its factorization.

421446551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 32.

The square root of 421446551 is about 20529.1634266962. The cubic root of 421446551 is about 749.7460182971.

The spelling of 421446551 in words is "four hundred twenty-one million, four hundred forty-six thousand, five hundred fifty-one".