1012231861 has 2 divisors, whose sum is σ = 1012231862. Its totient is φ = 1012231860.

The previous prime is 1012231841. The next prime is 1012231873. The reversal of 1012231861 is 1681322101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1012194225 + 37636 = 31815^2 + 194^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012231861 - 2⁹ = 1012231349 is a prime.

It is a super-2 number, since 2×1012231861² = 2049226680847046642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012231811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506115930 + 506115931.

It is an arithmetic number, because the mean of its divisors is an integer number (506115931).

Almost surely, 2^1012231861 is an apocalyptic number.

It is an amenable number.

1012231861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012231861 is an equidigital number, since it uses as much as digits as its factorization.

1012231861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1012231861 is about 31815.5914765072. The cubic root of 1012231861 is about 1004.0607747875.

Adding to 1012231861 its reverse (1681322101), we get a palindrome (2693553962).

The spelling of 1012231861 in words is "one billion, twelve million, two hundred thirty-one thousand, eight hundred sixty-one".