1572055561 has 2 divisors, whose sum is σ = 1572055562. Its totient is φ = 1572055560.

The previous prime is 1572055549. The next prime is 1572055609. The reversal of 1572055561 is 1655502751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1099254025 + 472801536 = 33155^2 + 21744^2 .

It is a cyclic number.

It is not a de Polignac number, because 1572055561 - 2²⁹ = 1035184649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1572055561.

It is not a weakly prime, because it can be changed into another prime (1572155561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 786027780 + 786027781.

It is an arithmetic number, because the mean of its divisors is an integer number (786027781).

Almost surely, 2^1572055561 is an apocalyptic number.

It is an amenable number.

1572055561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1572055561 is an equidigital number, since it uses as much as digits as its factorization.

1572055561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52500, while the sum is 37.

The square root of 1572055561 is about 39649.1558674330. The cubic root of 1572055561 is about 1162.7578951628.

The spelling of 1572055561 in words is "one billion, five hundred seventy-two million, fifty-five thousand, five hundred sixty-one".