70902581 has 2 divisors, whose sum is σ = 70902582. Its totient is φ = 70902580.

The previous prime is 70902553. The next prime is 70902589. The reversal of 70902581 is 18520907.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57138481 + 13764100 = 7559^2 + 3710^2 .

It is an emirp because it is prime and its reverse (18520907) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70902581 - 2¹⁴ = 70886197 is a prime.

It is a super-2 number, since 2×70902581² = 10054351984923122, 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 (70902589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35451290 + 35451291.

It is an arithmetic number, because the mean of its divisors is an integer number (35451291).

Almost surely, 2^70902581 is an apocalyptic number.

It is an amenable number.

70902581 is a deficient number, since it is larger than the sum of its proper divisors (1).

70902581 is an equidigital number, since it uses as much as digits as its factorization.

70902581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 70902581 is about 8420.3670347557. The cubic root of 70902581 is about 413.8923012503.

The spelling of 70902581 in words is "seventy million, nine hundred two thousand, five hundred eighty-one".