221674487 has 2 divisors, whose sum is σ = 221674488. Its totient is φ = 221674486.

The previous prime is 221674433. The next prime is 221674517. The reversal of 221674487 is 784476122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221674487 - 2¹⁸ = 221412343 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 (221671487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110837243 + 110837244.

It is an arithmetic number, because the mean of its divisors is an integer number (110837244).

Almost surely, 2^221674487 is an apocalyptic number.

221674487 is a deficient number, since it is larger than the sum of its proper divisors (1).

221674487 is an equidigital number, since it uses as much as digits as its factorization.

221674487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 41.

The square root of 221674487 is about 14888.7369175495. The cubic root of 221674487 is about 605.2088043697.

The spelling of 221674487 in words is "two hundred twenty-one million, six hundred seventy-four thousand, four hundred eighty-seven".