70520551 has 4 divisors (see below), whose sum is σ = 70592704. Its totient is φ = 70448400.

The previous prime is 70520531. The next prime is 70520561. The reversal of 70520551 is 15502507.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15502507 = 2677 ⋅5791.

It is a cyclic number.

It is not a de Polignac number, because 70520551 - 2⁵ = 70520519 is a prime.

It is a super-2 number, since 2×70520551² = 9946296226687202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70520531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34590 + ... + 36571.

It is an arithmetic number, because the mean of its divisors is an integer number (17648176).

Almost surely, 2^70520551 is an apocalyptic number.

70520551 is a deficient number, since it is larger than the sum of its proper divisors (72153).

70520551 is an equidigital number, since it uses as much as digits as its factorization.

70520551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72152.

The product of its (nonzero) digits is 1750, while the sum is 25.

The square root of 70520551 is about 8397.6515169421. The cubic root of 70520551 is about 413.1475981468.

It can be divided in two parts, 70520 and 551, that multiplied together give a triangular number (38856520 = T₈₈₁₅).

The spelling of 70520551 in words is "seventy million, five hundred twenty thousand, five hundred fifty-one".