123012315453257 has 2 divisors, whose sum is σ = 123012315453258. Its totient is φ = 123012315453256.

The previous prime is 123012315453227. The next prime is 123012315453271. The reversal of 123012315453257 is 752354513210321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122178182123776 + 834133329481 = 11053424^2 + 913309^2 .

It is a cyclic number.

It is not a de Polignac number, because 123012315453257 - 2¹⁰ = 123012315452233 is a prime.

It is a super-2 number, since 2×123012315453257² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123012315453217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61506157726628 + 61506157726629.

It is an arithmetic number, because the mean of its divisors is an integer number (61506157726629).

Almost surely, 2^{123012315453257} is an apocalyptic number.

It is an amenable number.

123012315453257 is a deficient number, since it is larger than the sum of its proper divisors (1).

123012315453257 is an equidigital number, since it uses as much as digits as its factorization.

123012315453257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756000, while the sum is 44.

Adding to 123012315453257 its reverse (752354513210321), we get a palindrome (875366828663578).

The spelling of 123012315453257 in words is "one hundred twenty-three trillion, twelve billion, three hundred fifteen million, four hundred fifty-three thousand, two hundred fifty-seven".