70537781 has 2 divisors, whose sum is σ = 70537782. Its totient is φ = 70537780.

The previous prime is 70537771. The next prime is 70537787. The reversal of 70537781 is 18773507.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67798756 + 2739025 = 8234^2 + 1655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70537781 is a prime.

It is a super-2 number, since 2×70537781² = 9951157096807922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70537787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35268890 + 35268891.

It is an arithmetic number, because the mean of its divisors is an integer number (35268891).

Almost surely, 2^70537781 is an apocalyptic number.

It is an amenable number.

70537781 is a deficient number, since it is larger than the sum of its proper divisors (1).

70537781 is an equidigital number, since it uses as much as digits as its factorization.

70537781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41160, while the sum is 38.

The square root of 70537781 is about 8398.6773363429. The cubic root of 70537781 is about 413.1812429654.

The spelling of 70537781 in words is "seventy million, five hundred thirty-seven thousand, seven hundred eighty-one".