1573488661 has 2 divisors, whose sum is σ = 1573488662. Its totient is φ = 1573488660.

The previous prime is 1573488649. The next prime is 1573488671. The reversal of 1573488661 is 1668843751.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1448183025 + 125305636 = 38055^2 + 11194^2 .

It is a cyclic number.

It is not a de Polignac number, because 1573488661 - 2⁹ = 1573488149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1573488671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 786744330 + 786744331.

It is an arithmetic number, because the mean of its divisors is an integer number (786744331).

Almost surely, 2^1573488661 is an apocalyptic number.

It is an amenable number.

1573488661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1573488661 is an equidigital number, since it uses as much as digits as its factorization.

1573488661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 49.

The square root of 1573488661 is about 39667.2240142917. The cubic root of 1573488661 is about 1163.1111147064. Note that the first 5 decimals are identical.

The spelling of 1573488661 in words is "one billion, five hundred seventy-three million, four hundred eighty-eight thousand, six hundred sixty-one".