1210100031 has 18 divisors (see below), whose sum is σ = 2033298072. Its totient is φ = 691485480.

The previous prime is 1210100029. The next prime is 1210100053. The reversal of 1210100031 is 1300010121.

It is not a de Polignac number, because 1210100031 - 2¹ = 1210100029 is a prime.

It is a super-2 number, since 2×1210100031² = 2928684170052401922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1210099986 and 1210100022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210100071) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 1371555 + ... + 1372436.

It is an arithmetic number, because the mean of its divisors is an integer number (112961004).

Almost surely, 2^1210100031 is an apocalyptic number.

1210100031 is a deficient number, since it is larger than the sum of its proper divisors (823198041).

1210100031 is a wasteful number, since it uses less digits than its factorization.

1210100031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2744011 (or 2744001 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 1210100031 is about 34786.4920766668. The cubic root of 1210100031 is about 1065.6316004912.

Adding to 1210100031 its reverse (1300010121), we get a palindrome (2510110152).

The spelling of 1210100031 in words is "one billion, two hundred ten million, one hundred thousand, thirty-one".