1243010101 has 4 divisors (see below), whose sum is σ = 1243900000. Its totient is φ = 1242120204.

The previous prime is 1243010059. The next prime is 1243010117. The reversal of 1243010101 is 1010103421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1010103421 = 3803 ⋅265607.

It is a cyclic number.

It is not a de Polignac number, because 1243010101 - 2⁷ = 1243009973 is a prime.

It is a super-2 number, since 2×1243010101² = 3090148222376060402, which contains 22 as substring.

It is a Duffinian number.

1243010101 is a modest number, since divided by 10101 gives 1243 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243010701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442851 + ... + 445648.

It is an arithmetic number, because the mean of its divisors is an integer number (310975000).

Almost surely, 2^1243010101 is an apocalyptic number.

It is an amenable number.

1243010101 is a deficient number, since it is larger than the sum of its proper divisors (889899).

1243010101 is an equidigital number, since it uses as much as digits as its factorization.

1243010101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889898.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1243010101 is about 35256.3483786963. The cubic root of 1243010101 is about 1075.2056865481.

Adding to 1243010101 its reverse (1010103421), we get a palindrome (2253113522).

It can be divided in two parts, 124 and 3010101, that added together give a square (3010225 = 1735²).

The spelling of 1243010101 in words is "one billion, two hundred forty-three million, ten thousand, one hundred one".