70531999 has 2 divisors, whose sum is σ = 70532000. Its totient is φ = 70531998.

The previous prime is 70531883. The next prime is 70532003. The reversal of 70531999 is 99913507.

It is a strong prime.

It is an emirp because it is prime and its reverse (99913507) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70531999 - 2¹¹ = 70529951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70531099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35265999 + 35266000.

It is an arithmetic number, because the mean of its divisors is an integer number (35266000).

Almost surely, 2^70531999 is an apocalyptic number.

70531999 is a deficient number, since it is larger than the sum of its proper divisors (1).

70531999 is an equidigital number, since it uses as much as digits as its factorization.

70531999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76545, while the sum is 43.

The square root of 70531999 is about 8398.3331084210. Note that the first 3 decimals coincide. The cubic root of 70531999 is about 413.1699531328.

The spelling of 70531999 in words is "seventy million, five hundred thirty-one thousand, nine hundred ninety-nine".