70897121 has 4 divisors (see below), whose sum is σ = 71895744. Its totient is φ = 69898500.

The previous prime is 70897117. The next prime is 70897129. The reversal of 70897121 is 12179807.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 70897121 - 2² = 70897117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (70897129) 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, 499205 + ... + 499346.

It is an arithmetic number, because the mean of its divisors is an integer number (17973936).

Almost surely, 2^70897121 is an apocalyptic number.

70897121 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

70897121 is a deficient number, since it is larger than the sum of its proper divisors (998623).

70897121 is an equidigital number, since it uses as much as digits as its factorization.

70897121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998622.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 70897121 is about 8420.0428146180. The cubic root of 70897121 is about 413.8816767664.

The spelling of 70897121 in words is "seventy million, eight hundred ninety-seven thousand, one hundred twenty-one".