1551611489 has 2 divisors, whose sum is σ = 1551611490. Its totient is φ = 1551611488.

The previous prime is 1551611443. The next prime is 1551611513. The reversal of 1551611489 is 9841161551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 886848400 + 664763089 = 29780^2 + 25783^2 .

It is a cyclic number.

It is not a de Polignac number, because 1551611489 - 2²⁰ = 1550562913 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 (1551611419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775805744 + 775805745.

It is an arithmetic number, because the mean of its divisors is an integer number (775805745).

Almost surely, 2^1551611489 is an apocalyptic number.

It is an amenable number.

1551611489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551611489 is an equidigital number, since it uses as much as digits as its factorization.

1551611489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 41.

The square root of 1551611489 is about 39390.4999841332. The cubic root of 1551611489 is about 1157.6954566084.

The spelling of 1551611489 in words is "one billion, five hundred fifty-one million, six hundred eleven thousand, four hundred eighty-nine".