70781131 has 4 divisors (see below), whose sum is σ = 70954600. Its totient is φ = 70607664.

The previous prime is 70781119. The next prime is 70781171. The reversal of 70781131 is 13118707.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13118707 = 7 ⋅1874101.

It is a cyclic number.

It is not a de Polignac number, because 70781131 - 2¹³ = 70772939 is a prime.

It is a super-2 number, since 2×70781131² = 10019937011278322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 70781131.

It is not an unprimeable number, because it can be changed into a prime (70781171) 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, 86121 + ... + 86938.

It is an arithmetic number, because the mean of its divisors is an integer number (17738650).

Almost surely, 2^70781131 is an apocalyptic number.

70781131 is a deficient number, since it is larger than the sum of its proper divisors (173469).

70781131 is a wasteful number, since it uses less digits than its factorization.

70781131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173468.

The product of its (nonzero) digits is 1176, while the sum is 28.

The square root of 70781131 is about 8413.1522629749. The cubic root of 70781131 is about 413.6558455963.

Adding to 70781131 its reverse (13118707), we get a palindrome (83899838).

The spelling of 70781131 in words is "seventy million, seven hundred eighty-one thousand, one hundred thirty-one".