70117921 has 2 divisors, whose sum is σ = 70117922. Its totient is φ = 70117920.

The previous prime is 70117903. The next prime is 70117933. The reversal of 70117921 is 12971107.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69906321 + 211600 = 8361^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 70117921 - 2⁵ = 70117889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 70117921.

It is not a weakly prime, because it can be changed into another prime (70117981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35058960 + 35058961.

It is an arithmetic number, because the mean of its divisors is an integer number (35058961).

Almost surely, 2^70117921 is an apocalyptic number.

It is an amenable number.

70117921 is a deficient number, since it is larger than the sum of its proper divisors (1).

70117921 is an equidigital number, since it uses as much as digits as its factorization.

70117921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 882, while the sum is 28.

The square root of 70117921 is about 8373.6444276074. The cubic root of 70117921 is about 412.3598220970.

The spelling of 70117921 in words is "seventy million, one hundred seventeen thousand, nine hundred twenty-one".