1211064550 has 36 divisors (see below), whose sum is σ = 2269878156. Its totient is φ = 480733600.

The previous prime is 1211064539. The next prime is 1211064571. The reversal of 1211064550 is 554601121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1109505 + ... + 1110595.

It is an arithmetic number, because the mean of its divisors is an integer number (63052171).

Almost surely, 2^1211064550 is an apocalyptic number.

1211064550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211064550 is a deficient number, since it is larger than the sum of its proper divisors (1058813606).

1211064550 is a wasteful number, since it uses less digits than its factorization.

1211064550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1401 (or 1247 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 1211064550 is about 34800.3527280975. The cubic root of 1211064550 is about 1065.9146484328.

Adding to 1211064550 its reverse (554601121), we get a palindrome (1765665671).

The spelling of 1211064550 in words is "one billion, two hundred eleven million, sixty-four thousand, five hundred fifty".