1251540453091 has 2 divisors, whose sum is σ = 1251540453092. Its totient is φ = 1251540453090.

The previous prime is 1251540453071. The next prime is 1251540453133. The reversal of 1251540453091 is 1903540451521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1251540453091 - 2¹⁹ = 1251539928803 is a prime.

It is not a weakly prime, because it can be changed into another prime (1251540453001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625770226545 + 625770226546.

It is an arithmetic number, because the mean of its divisors is an integer number (625770226546).

Almost surely, 2^{1251540453091} is an apocalyptic number.

1251540453091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251540453091 is an equidigital number, since it uses as much as digits as its factorization.

1251540453091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108000, while the sum is 40.

The spelling of 1251540453091 in words is "one trillion, two hundred fifty-one billion, five hundred forty million, four hundred fifty-three thousand, ninety-one".