1257241123 has 2 divisors, whose sum is σ = 1257241124. Its totient is φ = 1257241122.

The previous prime is 1257241121. The next prime is 1257241133. The reversal of 1257241123 is 3211427521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1257241123 - 2¹ = 1257241121 is a prime.

It is a super-2 number, since 2×1257241123² = 3161310482724602258, which contains 22 as substring.

Together with 1257241121, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1257241091 and 1257241100.

It is not a weakly prime, because it can be changed into another prime (1257241121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628620561 + 628620562.

It is an arithmetic number, because the mean of its divisors is an integer number (628620562).

Almost surely, 2^1257241123 is an apocalyptic number.

1257241123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257241123 is an equidigital number, since it uses as much as digits as its factorization.

1257241123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 28.

The square root of 1257241123 is about 35457.5961255131. The cubic root of 1257241123 is about 1079.2934115589.

Adding to 1257241123 its reverse (3211427521), we get a palindrome (4468668644).

The spelling of 1257241123 in words is "one billion, two hundred fifty-seven million, two hundred forty-one thousand, one hundred twenty-three".