1552500721 has 2 divisors, whose sum is σ = 1552500722. Its totient is φ = 1552500720.

The previous prime is 1552500701. The next prime is 1552500737. The reversal of 1552500721 is 1270052551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1522950625 + 29550096 = 39025^2 + 5436^2 .

It is a cyclic number.

It is not a de Polignac number, because 1552500721 - 2¹⁵ = 1552467953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1552500721.

It is not a weakly prime, because it can be changed into another prime (1552500701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776250360 + 776250361.

It is an arithmetic number, because the mean of its divisors is an integer number (776250361).

Almost surely, 2^1552500721 is an apocalyptic number.

It is an amenable number.

1552500721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1552500721 is an equidigital number, since it uses as much as digits as its factorization.

1552500721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3500, while the sum is 28.

The square root of 1552500721 is about 39401.7857590237. The cubic root of 1552500721 is about 1157.9165736544.

The spelling of 1552500721 in words is "one billion, five hundred fifty-two million, five hundred thousand, seven hundred twenty-one".