70491391 has 2 divisors, whose sum is σ = 70491392. Its totient is φ = 70491390.

The previous prime is 70491383. The next prime is 70491409. The reversal of 70491391 is 19319407.

It is a weak prime.

It is an emirp because it is prime and its reverse (19319407) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70491391 - 2³ = 70491383 is a prime.

It is a super-2 number, since 2×70491391² = 9938072410229762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70491331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35245695 + 35245696.

It is an arithmetic number, because the mean of its divisors is an integer number (35245696).

Almost surely, 2^70491391 is an apocalyptic number.

70491391 is a deficient number, since it is larger than the sum of its proper divisors (1).

70491391 is an equidigital number, since it uses as much as digits as its factorization.

70491391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 70491391 is about 8395.9151377322. The cubic root of 70491391 is about 413.0906452695.

The spelling of 70491391 in words is "seventy million, four hundred ninety-one thousand, three hundred ninety-one".