70861391 has 2 divisors, whose sum is σ = 70861392. Its totient is φ = 70861390.

The previous prime is 70861379. The next prime is 70861403. The reversal of 70861391 is 19316807.

It is a balanced prime because it is at equal distance from previous prime (70861379) and next prime (70861403).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70861391 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70861361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35430695 + 35430696.

It is an arithmetic number, because the mean of its divisors is an integer number (35430696).

Almost surely, 2^70861391 is an apocalyptic number.

70861391 is a deficient number, since it is larger than the sum of its proper divisors (1).

70861391 is an equidigital number, since it uses as much as digits as its factorization.

70861391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 70861391 is about 8417.9208240515. The cubic root of 70861391 is about 413.8121371432.

The spelling of 70861391 in words is "seventy million, eight hundred sixty-one thousand, three hundred ninety-one".