1211207445 has 128 divisors (see below), whose sum is σ = 2583060480. Its totient is φ = 526901760.

The previous prime is 1211207423. The next prime is 1211207461. The reversal of 1211207445 is 5447021121.

1211207445 is a `hidden beast` number, since 1 + 2 + 11 + 207 + 445 = 666.

It is not a de Polignac number, because 1211207445 - 2¹⁵ = 1211174677 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1665672 + ... + 1666398.

It is an arithmetic number, because the mean of its divisors is an integer number (20180160).

Almost surely, 2^1211207445 is an apocalyptic number.

1211207445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1211207445 is an abundant number, since it is smaller than the sum of its proper divisors (1371853035).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211207445 is a wasteful number, since it uses less digits than its factorization.

1211207445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832 (or 826 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 1211207445 is about 34802.4057358109. The cubic root of 1211207445 is about 1065.9565696454.

Adding to 1211207445 its reverse (5447021121), we get a palindrome (6658228566).

The spelling of 1211207445 in words is "one billion, two hundred eleven million, two hundred seven thousand, four hundred forty-five".