1552795721 has 2 divisors, whose sum is σ = 1552795722. Its totient is φ = 1552795720.

The previous prime is 1552795709. The next prime is 1552795733. The reversal of 1552795721 is 1275972551.

It is a balanced prime because it is at equal distance from previous prime (1552795709) and next prime (1552795733).

It can be written as a sum of positive squares in only one way, i.e., 1180884496 + 371911225 = 34364^2 + 19285^2 .

It is a cyclic number.

It is not a de Polignac number, because 1552795721 - 2¹⁰ = 1552794697 is a prime.

It is a super-2 number, since 2×1552795721² = 4822349102311819682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1552785721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776397860 + 776397861.

It is an arithmetic number, because the mean of its divisors is an integer number (776397861).

Almost surely, 2^1552795721 is an apocalyptic number.

It is an amenable number.

1552795721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1552795721 is an equidigital number, since it uses as much as digits as its factorization.

1552795721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 220500, while the sum is 44.

The square root of 1552795721 is about 39405.5290663633. The cubic root of 1552795721 is about 1157.9899099072.

The spelling of 1552795721 in words is "one billion, five hundred fifty-two million, seven hundred ninety-five thousand, seven hundred twenty-one".