70730731 has 2 divisors, whose sum is σ = 70730732. Its totient is φ = 70730730.

The previous prime is 70730719. The next prime is 70730741. The reversal of 70730731 is 13703707.

It is a strong prime.

It is an emirp because it is prime and its reverse (13703707) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70730731 is a prime.

It is a super-2 number, since 2×70730731² = 10005672615588722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 70730731.

It is not a weakly prime, because it can be changed into another prime (70730701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35365365 + 35365366.

It is an arithmetic number, because the mean of its divisors is an integer number (35365366).

Almost surely, 2^70730731 is an apocalyptic number.

70730731 is a deficient number, since it is larger than the sum of its proper divisors (1).

70730731 is an equidigital number, since it uses as much as digits as its factorization.

70730731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3087, while the sum is 28.

The square root of 70730731 is about 8410.1564194728. The cubic root of 70730731 is about 413.5576404926.

The spelling of 70730731 in words is "seventy million, seven hundred thirty thousand, seven hundred thirty-one".