1211206564 has 6 divisors (see below), whose sum is σ = 2119611494. Its totient is φ = 605603280.

The previous prime is 1211206559. The next prime is 1211206571. The reversal of 1211206564 is 4656021121.

It can be written as a sum of positive squares in only one way, i.e., 1164174400 + 47032164 = 34120^2 + 6858^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151400817 + ... + 151400824.

Almost surely, 2^1211206564 is an apocalyptic number.

It is an amenable number.

1211206564 is a deficient number, since it is larger than the sum of its proper divisors (908404930).

1211206564 is a wasteful number, since it uses less digits than its factorization.

1211206564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302801645 (or 302801643 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1211206564 is about 34802.3930786376. The cubic root of 1211206564 is about 1065.9563111959.

Adding to 1211206564 its reverse (4656021121), we get a palindrome (5867227685).

The spelling of 1211206564 in words is "one billion, two hundred eleven million, two hundred six thousand, five hundred sixty-four".