1012123257 has 16 divisors (see below), whose sum is σ = 1418463360. Its totient is φ = 640694912.

The previous prime is 1012123213. The next prime is 1012123283. The reversal of 1012123257 is 7523212101.

It is a cyclic number.

It is not a de Polignac number, because 1012123257 - 2⁷ = 1012123129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1012123657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44082 + ... + 62987.

It is an arithmetic number, because the mean of its divisors is an integer number (88653960).

Almost surely, 2^1012123257 is an apocalyptic number.

It is an amenable number.

1012123257 is a deficient number, since it is larger than the sum of its proper divisors (406340103).

1012123257 is a wasteful number, since it uses less digits than its factorization.

1012123257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107232.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 1012123257 is about 31813.8846574888. The cubic root of 1012123257 is about 1004.0248643996.

Adding to 1012123257 its reverse (7523212101), we get a palindrome (8535335358).

The spelling of 1012123257 in words is "one billion, twelve million, one hundred twenty-three thousand, two hundred fifty-seven".