70447981 has 2 divisors, whose sum is σ = 70447982. Its totient is φ = 70447980.

The previous prime is 70447973. The next prime is 70447987. The reversal of 70447981 is 18974407.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36120100 + 34327881 = 6010^2 + 5859^2 .

It is a cyclic number.

It is not a de Polignac number, because 70447981 - 2³ = 70447973 is a prime.

It is a super-2 number, since 2×70447981² = 9925836053952722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70447987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35223990 + 35223991.

It is an arithmetic number, because the mean of its divisors is an integer number (35223991).

Almost surely, 2^70447981 is an apocalyptic number.

It is an amenable number.

70447981 is a deficient number, since it is larger than the sum of its proper divisors (1).

70447981 is an equidigital number, since it uses as much as digits as its factorization.

70447981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 70447981 is about 8393.3295538779. The cubic root of 70447981 is about 413.0058313798.

The spelling of 70447981 in words is "seventy million, four hundred forty-seven thousand, nine hundred eighty-one".