70381391 has 4 divisors (see below), whose sum is σ = 70500672. Its totient is φ = 70262112.

The previous prime is 70381361. The next prime is 70381397. The reversal of 70381391 is 19318307.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 70381391 - 2¹⁰ = 70380367 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 (70381397) 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, 58751 + ... + 59936.

It is an arithmetic number, because the mean of its divisors is an integer number (17625168).

Almost surely, 2^70381391 is an apocalyptic number.

70381391 is a deficient number, since it is larger than the sum of its proper divisors (119281).

70381391 is a wasteful number, since it uses less digits than its factorization.

70381391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119280.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 70381391 is about 8389.3617754869. The cubic root of 70381391 is about 412.8756609676.

Adding to 70381391 its reverse (19318307), we get a palindrome (89699698).

The spelling of 70381391 in words is "seventy million, three hundred eighty-one thousand, three hundred ninety-one".