70739561 has 2 divisors, whose sum is σ = 70739562. Its totient is φ = 70739560.

The previous prime is 70739531. The next prime is 70739573. The reversal of 70739561 is 16593707.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61528336 + 9211225 = 7844^2 + 3035^2 .

It is a cyclic number.

It is not a de Polignac number, because 70739561 - 2¹⁰ = 70738537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70739531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35369780 + 35369781.

It is an arithmetic number, because the mean of its divisors is an integer number (35369781).

Almost surely, 2^70739561 is an apocalyptic number.

It is an amenable number.

70739561 is a deficient number, since it is larger than the sum of its proper divisors (1).

70739561 is an equidigital number, since it uses as much as digits as its factorization.

70739561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39690, while the sum is 38.

The square root of 70739561 is about 8410.6813635995. The cubic root of 70739561 is about 413.5748492408.

The spelling of 70739561 in words is "seventy million, seven hundred thirty-nine thousand, five hundred sixty-one".