1251423116533 has 2 divisors, whose sum is σ = 1251423116534. Its totient is φ = 1251423116532.

The previous prime is 1251423116473. The next prime is 1251423116539. The reversal of 1251423116533 is 3356113241521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1029772359729 + 221650756804 = 1014777^2 + 470798^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1251423116533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1251423116492 and 1251423116501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251423116539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625711558266 + 625711558267.

It is an arithmetic number, because the mean of its divisors is an integer number (625711558267).

Almost surely, 2^{1251423116533} is an apocalyptic number.

It is an amenable number.

1251423116533 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251423116533 is an equidigital number, since it uses as much as digits as its factorization.

1251423116533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 37.

The spelling of 1251423116533 in words is "one trillion, two hundred fifty-one billion, four hundred twenty-three million, one hundred sixteen thousand, five hundred thirty-three".