1211230031 has 16 divisors (see below), whose sum is σ = 1393203840. Its totient is φ = 1041426720.

The previous prime is 1211230021. The next prime is 1211230043. The reversal of 1211230031 is 1300321121.

It is a cyclic number.

It is not a de Polignac number, because 1211230031 - 2¹⁰ = 1211229007 is a prime.

It is a super-2 number, since 2×1211230031² = 2934156375992521922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211229988 and 1211230015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211230021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129881 + ... + 138893.

It is an arithmetic number, because the mean of its divisors is an integer number (87075240).

Almost surely, 2^1211230031 is an apocalyptic number.

1211230031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211230031 is a deficient number, since it is larger than the sum of its proper divisors (181973809).

1211230031 is a wasteful number, since it uses less digits than its factorization.

1211230031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9686.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1211230031 is about 34802.7302233604. The cubic root of 1211230031 is about 1065.9631954153.

Adding to 1211230031 its reverse (1300321121), we get a palindrome (2511551152).

The spelling of 1211230031 in words is "one billion, two hundred eleven million, two hundred thirty thousand, thirty-one".