70287731 has 2 divisors, whose sum is σ = 70287732. Its totient is φ = 70287730.

The previous prime is 70287691. The next prime is 70287733. The reversal of 70287731 is 13778207.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 70287731 - 2⁶ = 70287667 is a prime.

It is a super-2 number, since 2×70287731² = 9880730258256722, which contains 22 as substring.

Together with 70287733, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 70287691 and 70287700.

It is not a weakly prime, because it can be changed into another prime (70287733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35143865 + 35143866.

It is an arithmetic number, because the mean of its divisors is an integer number (35143866).

Almost surely, 2^70287731 is an apocalyptic number.

70287731 is a deficient number, since it is larger than the sum of its proper divisors (1).

70287731 is an equidigital number, since it uses as much as digits as its factorization.

70287731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 70287731 is about 8383.7778477247. Note that the first 3 decimals coincide. The cubic root of 70287731 is about 412.6924349762.

The spelling of 70287731 in words is "seventy million, two hundred eighty-seven thousand, seven hundred thirty-one".