705215551 has 4 divisors (see below), whose sum is σ = 714876112. Its totient is φ = 695554992.

The previous prime is 705215549. The next prime is 705215587. The reversal of 705215551 is 155512507.

705215551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155512507 = 71 ⋅2190317.

It is a cyclic number.

It is not a de Polignac number, because 705215551 - 2¹ = 705215549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (705215501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4830171 + ... + 4830316.

It is an arithmetic number, because the mean of its divisors is an integer number (178719028).

Almost surely, 2^705215551 is an apocalyptic number.

705215551 is a deficient number, since it is larger than the sum of its proper divisors (9660561).

705215551 is an equidigital number, since it uses as much as digits as its factorization.

705215551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9660560.

The product of its (nonzero) digits is 8750, while the sum is 31.

The square root of 705215551 is about 26555.8948446480. The cubic root of 705215551 is about 890.1037420625.

The spelling of 705215551 in words is "seven hundred five million, two hundred fifteen thousand, five hundred fifty-one".