70712561 has 4 divisors (see below), whose sum is σ = 70870500. Its totient is φ = 70554624.

The previous prime is 70712489. The next prime is 70712567. The reversal of 70712561 is 16521707.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36372961 + 34339600 = 6031^2 + 5860^2 .

It is a cyclic number.

It is not a de Polignac number, because 70712561 - 2¹⁸ = 70450417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70712567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78296 + ... + 79193.

It is an arithmetic number, because the mean of its divisors is an integer number (17717625).

Almost surely, 2^70712561 is an apocalyptic number.

It is an amenable number.

70712561 is a deficient number, since it is larger than the sum of its proper divisors (157939).

70712561 is a wasteful number, since it uses less digits than its factorization.

70712561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157938.

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 70712561 is about 8409.0761085865. The cubic root of 70712561 is about 413.5222245531.

The spelling of 70712561 in words is "seventy million, seven hundred twelve thousand, five hundred sixty-one".