70989251 has 2 divisors, whose sum is σ = 70989252. Its totient is φ = 70989250.

The previous prime is 70989241. The next prime is 70989253. The reversal of 70989251 is 15298907.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70989251 is a prime.

Together with 70989253, 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 = 70989199 and 70989208.

It is not a weakly prime, because it can be changed into another prime (70989253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35494625 + 35494626.

It is an arithmetic number, because the mean of its divisors is an integer number (35494626).

Almost surely, 2^70989251 is an apocalyptic number.

70989251 is a deficient number, since it is larger than the sum of its proper divisors (1).

70989251 is an equidigital number, since it uses as much as digits as its factorization.

70989251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 70989251 is about 8425.5119132311. The cubic root of 70989251 is about 414.0608773384.

The spelling of 70989251 in words is "seventy million, nine hundred eighty-nine thousand, two hundred fifty-one".