70441991 has 4 divisors (see below), whose sum is σ = 71493432. Its totient is φ = 69390552.

The previous prime is 70441963. The next prime is 70442023. The reversal of 70441991 is 19914407.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19914407 = 1301 ⋅15307.

It is a cyclic number.

It is not a de Polignac number, because 70441991 - 2⁶ = 70441927 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 (70441291) 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, 525620 + ... + 525753.

It is an arithmetic number, because the mean of its divisors is an integer number (17873358).

Almost surely, 2^70441991 is an apocalyptic number.

70441991 is a deficient number, since it is larger than the sum of its proper divisors (1051441).

70441991 is a wasteful number, since it uses less digits than its factorization.

70441991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051440.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 70441991 is about 8392.9727153137. The cubic root of 70441991 is about 412.9941254609.

The spelling of 70441991 in words is "seventy million, four hundred forty-one thousand, nine hundred ninety-one".