4191221477 has 2 divisors, whose sum is σ = 4191221478. Its totient is φ = 4191221476.

The previous prime is 4191221473. The next prime is 4191221561. The reversal of 4191221477 is 7741221914.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2513417956 + 1677803521 = 50134^2 + 40961^2 .

It is a cyclic number.

It is not a de Polignac number, because 4191221477 - 2² = 4191221473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4191221477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4191221473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2095610738 + 2095610739.

It is an arithmetic number, because the mean of its divisors is an integer number (2095610739).

Almost surely, 2^4191221477 is an apocalyptic number.

It is an amenable number.

4191221477 is a deficient number, since it is larger than the sum of its proper divisors (1).

4191221477 is an equidigital number, since it uses as much as digits as its factorization.

4191221477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 38.

The square root of 4191221477 is about 64739.6437818436. The cubic root of 4191221477 is about 1612.3037730251.

The spelling of 4191221477 in words is "four billion, one hundred ninety-one million, two hundred twenty-one thousand, four hundred seventy-seven".