70390531 has 2 divisors, whose sum is σ = 70390532. Its totient is φ = 70390530.

The previous prime is 70390513. The next prime is 70390543. The reversal of 70390531 is 13509307.

Together with previous prime (70390513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 70390531 - 2⁵ = 70390499 is a prime.

It is a super-2 number, since 2×70390531² = 9909653708923922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 70390531.

It is not a weakly prime, because it can be changed into another prime (70390561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35195265 + 35195266.

It is an arithmetic number, because the mean of its divisors is an integer number (35195266).

Almost surely, 2^70390531 is an apocalyptic number.

70390531 is a deficient number, since it is larger than the sum of its proper divisors (1).

70390531 is an equidigital number, since it uses as much as digits as its factorization.

70390531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2835, while the sum is 28.

The square root of 70390531 is about 8389.9064953073. The cubic root of 70390531 is about 412.8935327381.

Adding to 70390531 its reverse (13509307), we get a palindrome (83899838).

The spelling of 70390531 in words is "seventy million, three hundred ninety thousand, five hundred thirty-one".