1211904045 has 64 divisors (see below), whose sum is σ = 2405145600. Its totient is φ = 573894720.

The previous prime is 1211904013. The next prime is 1211904061. The reversal of 1211904045 is 5404091121.

It is not a de Polignac number, because 1211904045 - 2⁵ = 1211904013 is a prime.

It is a super-2 number, since 2×1211904045² = 2937422828574724050, which contains 22 as substring.

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 polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 54366 + ... + 73344.

It is an arithmetic number, because the mean of its divisors is an integer number (37580400).

Almost surely, 2^1211904045 is an apocalyptic number.

1211904045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1211904045 is a deficient number, since it is larger than the sum of its proper divisors (1193241555).

1211904045 is a wasteful number, since it uses less digits than its factorization.

1211904045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19047 (or 19041 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1211904045 is about 34812.4122261012. The cubic root of 1211904045 is about 1066.1608845055.

Adding to 1211904045 its reverse (5404091121), we get a palindrome (6615995166).

The spelling of 1211904045 in words is "one billion, two hundred eleven million, nine hundred four thousand, forty-five".