1641225506 has 4 divisors (see below), whose sum is σ = 2461838262. Its totient is φ = 820612752.

The previous prime is 1641225499. The next prime is 1641225517. The reversal of 1641225506 is 6055221461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1611621025 + 29604481 = 40145^2 + 5441^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410306375 + ... + 410306378.

Almost surely, 2^1641225506 is an apocalyptic number.

1641225506 is a deficient number, since it is larger than the sum of its proper divisors (820612756).

1641225506 is an equidigital number, since it uses as much as digits as its factorization.

1641225506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820612755.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 1641225506 is about 40512.0414938571. The cubic root of 1641225506 is about 1179.5673761186.

Adding to 1641225506 its reverse (6055221461), we get a palindrome (7696446967).

The spelling of 1641225506 in words is "one billion, six hundred forty-one million, two hundred twenty-five thousand, five hundred six".