1211234690 has 16 divisors (see below), whose sum is σ = 2181773880. Its totient is φ = 484149120.

The previous prime is 1211234617. The next prime is 1211234719. The reversal of 1211234690 is 964321121.

It can be written as a sum of positive squares in 4 ways, for example, as 589081441 + 622153249 = 24271^2 + 24943^2 .

It is a super-2 number, since 2×1211234690² = 2934178948518792200, which contains 22 as substring.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 28091 + ... + 56670.

Almost surely, 2^1211234690 is an apocalyptic number.

1211234690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211234690 is a deficient number, since it is larger than the sum of its proper divisors (970539190).

1211234690 is a wasteful number, since it uses less digits than its factorization.

1211234690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86197.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1211234690 is about 34802.7971576998. The cubic root of 1211234690 is about 1065.9645621571.

The spelling of 1211234690 in words is "one billion, two hundred eleven million, two hundred thirty-four thousand, six hundred ninety".