70782121 has 2 divisors, whose sum is σ = 70782122. Its totient is φ = 70782120.

The previous prime is 70782091. The next prime is 70782137. The reversal of 70782121 is 12128707.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59892121 + 10890000 = 7739^2 + 3300^2 .

It is a cyclic number.

It is not a de Polignac number, because 70782121 - 2¹⁵ = 70749353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 70782121.

It is not a weakly prime, because it can be changed into another prime (70782181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35391060 + 35391061.

It is an arithmetic number, because the mean of its divisors is an integer number (35391061).

Almost surely, 2^70782121 is an apocalyptic number.

It is an amenable number.

70782121 is a deficient number, since it is larger than the sum of its proper divisors (1).

70782121 is an equidigital number, since it uses as much as digits as its factorization.

70782121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 70782121 is about 8413.2110992177. The cubic root of 70782121 is about 413.6577741582.

It can be divided in two parts, 707 and 82121, that added together give a palindrome (82828).

The spelling of 70782121 in words is "seventy million, seven hundred eighty-two thousand, one hundred twenty-one".