70561637 has 2 divisors, whose sum is σ = 70561638. Its totient is φ = 70561636.

The previous prime is 70561613. The next prime is 70561639. The reversal of 70561637 is 73616507.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49758916 + 20802721 = 7054^2 + 4561^2 .

It is a cyclic number.

It is not a de Polignac number, because 70561637 - 2¹⁴ = 70545253 is a prime.

It is a super-2 number, since 2×70561637² = 9957889232239538, which contains 22 as substring.

Together with 70561639, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 70561597 and 70561606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70561639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35280818 + 35280819.

It is an arithmetic number, because the mean of its divisors is an integer number (35280819).

Almost surely, 2^70561637 is an apocalyptic number.

It is an amenable number.

70561637 is a deficient number, since it is larger than the sum of its proper divisors (1).

70561637 is an equidigital number, since it uses as much as digits as its factorization.

70561637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26460, while the sum is 35.

The square root of 70561637 is about 8400.0974399110. The cubic root of 70561637 is about 413.2278172532.

The spelling of 70561637 in words is "seventy million, five hundred sixty-one thousand, six hundred thirty-seven".