1251312120437 has 2 divisors, whose sum is σ = 1251312120438. Its totient is φ = 1251312120436.

The previous prime is 1251312120371. The next prime is 1251312120451. The reversal of 1251312120437 is 7340212131521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 867712743121 + 383599377316 = 931511^2 + 619354^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251312120437 - 2¹⁶ = 1251312054901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251312120467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625656060218 + 625656060219.

It is an arithmetic number, because the mean of its divisors is an integer number (625656060219).

Almost surely, 2^{1251312120437} is an apocalyptic number.

It is an amenable number.

1251312120437 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251312120437 is an equidigital number, since it uses as much as digits as its factorization.

1251312120437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

Adding to 1251312120437 its reverse (7340212131521), we get a palindrome (8591524251958).

The spelling of 1251312120437 in words is "one trillion, two hundred fifty-one billion, three hundred twelve million, one hundred twenty thousand, four hundred thirty-seven".