70831381 has 2 divisors, whose sum is σ = 70831382. Its totient is φ = 70831380.

The previous prime is 70831339. The next prime is 70831391. The reversal of 70831381 is 18313807.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70408881 + 422500 = 8391^2 + 650^2 .

It is a cyclic number.

It is not a de Polignac number, because 70831381 - 2¹¹ = 70829333 is a prime.

It is a super-2 number, since 2×70831381² = 10034169068734322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70831391) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35415690 + 35415691.

It is an arithmetic number, because the mean of its divisors is an integer number (35415691).

Almost surely, 2^70831381 is an apocalyptic number.

It is an amenable number.

70831381 is a deficient number, since it is larger than the sum of its proper divisors (1).

70831381 is an equidigital number, since it uses as much as digits as its factorization.

70831381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 70831381 is about 8416.1381286193. The cubic root of 70831381 is about 413.7537120236.

It can be divided in two parts, 7083 and 1381, that added together give a square (8464 = 92²).

The spelling of 70831381 in words is "seventy million, eight hundred thirty-one thousand, three hundred eighty-one".