1501273121 has 2 divisors, whose sum is σ = 1501273122. Its totient is φ = 1501273120.

The previous prime is 1501273117. The next prime is 1501273127. The reversal of 1501273121 is 1213721051.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1204090000 + 297183121 = 34700^2 + 17239^2 .

It is an emirp because it is prime and its reverse (1213721051) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1501273121 - 2² = 1501273117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1501273127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 750636560 + 750636561.

It is an arithmetic number, because the mean of its divisors is an integer number (750636561).

Almost surely, 2^1501273121 is an apocalyptic number.

It is an amenable number.

1501273121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1501273121 is an equidigital number, since it uses as much as digits as its factorization.

1501273121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 1501273121 is about 38746.2658975029. The cubic root of 1501273121 is about 1145.0380086923.

Adding to 1501273121 its reverse (1213721051), we get a palindrome (2714994172).

The spelling of 1501273121 in words is "one billion, five hundred one million, two hundred seventy-three thousand, one hundred twenty-one".