1211671005 has 64 divisors (see below), whose sum is σ = 2123573760. Its totient is φ = 587464704.

The previous prime is 1211671003. The next prime is 1211671033. The reversal of 1211671005 is 5001761121.

It is not a de Polignac number, because 1211671005 - 2¹ = 1211671003 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211671003) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1575261 + ... + 1576029.

It is an arithmetic number, because the mean of its divisors is an integer number (33180840).

Almost surely, 2^1211671005 is an apocalyptic number.

1211671005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1211671005 is a deficient number, since it is larger than the sum of its proper divisors (911902755).

1211671005 is a wasteful number, since it uses less digits than its factorization.

1211671005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998.

The product of its (nonzero) digits is 420, while the sum is 24.

The square root of 1211671005 is about 34809.0649831333. The cubic root of 1211671005 is about 1066.0925418946.

The spelling of 1211671005 in words is "one billion, two hundred eleven million, six hundred seventy-one thousand, five".