1251533519969 has 2 divisors, whose sum is σ = 1251533519970. Its totient is φ = 1251533519968.

The previous prime is 1251533519939. The next prime is 1251533520001. The reversal of 1251533519969 is 9699153351521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1237923264400 + 13610255569 = 1112620^2 + 116663^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251533519969 - 2¹² = 1251533515873 is a prime.

It is a super-2 number, since 2×1251533519969² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1251533519939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625766759984 + 625766759985.

It is an arithmetic number, because the mean of its divisors is an integer number (625766759985).

Almost surely, 2^{1251533519969} is an apocalyptic number.

It is an amenable number.

1251533519969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251533519969 is an equidigital number, since it uses as much as digits as its factorization.

1251533519969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9841500, while the sum is 59.

The spelling of 1251533519969 in words is "one trillion, two hundred fifty-one billion, five hundred thirty-three million, five hundred nineteen thousand, nine hundred sixty-nine".