1640211225 has 12 divisors (see below), whose sum is σ = 2711816016. Its totient is φ = 874779280.

The previous prime is 1640211211. The next prime is 1640211241. The reversal of 1640211225 is 5221120461.

It is not a de Polignac number, because 1640211225 - 2¹¹ = 1640209177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1640211195 and 1640211204.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10934667 + ... + 10934816.

It is an arithmetic number, because the mean of its divisors is an integer number (225984668).

Almost surely, 2^1640211225 is an apocalyptic number.

1640211225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1640211225 is a deficient number, since it is larger than the sum of its proper divisors (1071604791).

1640211225 is a wasteful number, since it uses less digits than its factorization.

1640211225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21869496 (or 21869491 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1640211225 is about 40499.5212934672. The cubic root of 1640211225 is about 1179.3243342940.

Adding to 1640211225 its reverse (5221120461), we get a palindrome (6861331686).

The spelling of 1640211225 in words is "one billion, six hundred forty million, two hundred eleven thousand, two hundred twenty-five".