1251542164 has 6 divisors (see below), whose sum is σ = 2190198794. Its totient is φ = 625771080.

The previous prime is 1251542147. The next prime is 1251542189. The reversal of 1251542164 is 4612451521.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1025280400 + 226261764 = 32020^2 + 15042^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156442767 + ... + 156442774.

Almost surely, 2^1251542164 is an apocalyptic number.

It is an amenable number.

1251542164 is a deficient number, since it is larger than the sum of its proper divisors (938656630).

1251542164 is a wasteful number, since it uses less digits than its factorization.

1251542164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312885545 (or 312885543 counting only the distinct ones).

The product of its digits is 9600, while the sum is 31.

The square root of 1251542164 is about 35377.1418291529. The cubic root of 1251542164 is about 1077.6601618428.

Adding to 1251542164 its reverse (4612451521), we get a palindrome (5863993685).

The spelling of 1251542164 in words is "one billion, two hundred fifty-one million, five hundred forty-two thousand, one hundred sixty-four".