1491712069 has 2 divisors, whose sum is σ = 1491712070. Its totient is φ = 1491712068.

The previous prime is 1491712037. The next prime is 1491712093. The reversal of 1491712069 is 9602171941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1481865025 + 9847044 = 38495^2 + 3138^2 .

It is a cyclic number.

It is not a de Polignac number, because 1491712069 - 2⁵ = 1491712037 is a prime.

It is a super-2 number, since 2×1491712069² = 4450409793600521522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1491712099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745856034 + 745856035.

It is an arithmetic number, because the mean of its divisors is an integer number (745856035).

Almost surely, 2^1491712069 is an apocalyptic number.

It is an amenable number.

1491712069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491712069 is an equidigital number, since it uses as much as digits as its factorization.

1491712069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 1491712069 is about 38622.6885263054. The cubic root of 1491712069 is about 1142.6020559160.

The spelling of 1491712069 in words is "one billion, four hundred ninety-one million, seven hundred twelve thousand, sixty-nine".