1251533137 has 2 divisors, whose sum is σ = 1251533138. Its totient is φ = 1251533136.

The previous prime is 1251533123. The next prime is 1251533141. The reversal of 1251533137 is 7313351521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 806787216 + 444745921 = 28404^2 + 21089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1251533137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1251533099 and 1251533108.

It is not a weakly prime, because it can be changed into another prime (1251533167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625766568 + 625766569.

It is an arithmetic number, because the mean of its divisors is an integer number (625766569).

Almost surely, 2^1251533137 is an apocalyptic number.

It is an amenable number.

1251533137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251533137 is an equidigital number, since it uses as much as digits as its factorization.

1251533137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9450, while the sum is 31.

The square root of 1251533137 is about 35377.0142465415. The cubic root of 1251533137 is about 1077.6575708895.

Adding to 1251533137 its reverse (7313351521), we get a palindrome (8564884658).

The spelling of 1251533137 in words is "one billion, two hundred fifty-one million, five hundred thirty-three thousand, one hundred thirty-seven".