70991421 has 8 divisors (see below), whose sum is σ = 94785600. Its totient is φ = 47262432.

The previous prime is 70991387. The next prime is 70991423. The reversal of 70991421 is 12419907.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 70991421 - 2²⁵ = 37436989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70991423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13696 + ... + 18153.

It is an arithmetic number, because the mean of its divisors is an integer number (11848200).

Almost surely, 2^70991421 is an apocalyptic number.

It is an amenable number.

70991421 is a deficient number, since it is larger than the sum of its proper divisors (23794179).

70991421 is a wasteful number, since it uses less digits than its factorization.

70991421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32595.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 70991421 is about 8425.6406878053. The cubic root of 70991421 is about 414.0650963008.

The spelling of 70991421 in words is "seventy million, nine hundred ninety-one thousand, four hundred twenty-one".