70745881 has 2 divisors, whose sum is σ = 70745882. Its totient is φ = 70745880.

The previous prime is 70745809. The next prime is 70745921. The reversal of 70745881 is 18854707.

It is an a-pointer prime, because the next prime (70745921) can be obtained adding 70745881 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69555600 + 1190281 = 8340^2 + 1091^2 .

It is a cyclic number.

It is not a de Polignac number, because 70745881 - 2¹⁷ = 70614809 is a prime.

It is a super-2 number, since 2×70745881² = 10009959356932322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (70745281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35372940 + 35372941.

It is an arithmetic number, because the mean of its divisors is an integer number (35372941).

Almost surely, 2^70745881 is an apocalyptic number.

It is an amenable number.

70745881 is a deficient number, since it is larger than the sum of its proper divisors (1).

70745881 is an equidigital number, since it uses as much as digits as its factorization.

70745881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 70745881 is about 8411.0570679315. The cubic root of 70745881 is about 413.5871653817.

The spelling of 70745881 in words is "seventy million, seven hundred forty-five thousand, eight hundred eighty-one".