70531661 has 2 divisors, whose sum is σ = 70531662. Its totient is φ = 70531660.

The previous prime is 70531649. The next prime is 70531673. The reversal of 70531661 is 16613507.

It is a balanced prime because it is at equal distance from previous prime (70531649) and next prime (70531673).

It can be written as a sum of positive squares in only one way, i.e., 69388900 + 1142761 = 8330^2 + 1069^2 .

It is a cyclic number.

It is not a de Polignac number, because 70531661 - 2⁶ = 70531597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70531261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35265830 + 35265831.

It is an arithmetic number, because the mean of its divisors is an integer number (35265831).

Almost surely, 2^70531661 is an apocalyptic number.

It is an amenable number.

70531661 is a deficient number, since it is larger than the sum of its proper divisors (1).

70531661 is an equidigital number, since it uses as much as digits as its factorization.

70531661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 70531661 is about 8398.3129853560. The cubic root of 70531661 is about 413.1692931408.

The spelling of 70531661 in words is "seventy million, five hundred thirty-one thousand, six hundred sixty-one".