652660381 has 2 divisors, whose sum is σ = 652660382. Its totient is φ = 652660380.

The previous prime is 652660343. The next prime is 652660387. The reversal of 652660381 is 183066256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 435097881 + 217562500 = 20859^2 + 14750^2 .

It is a cyclic number.

It is not a de Polignac number, because 652660381 - 2¹¹ = 652658333 is a prime.

It is a super-2 number, since 2×652660381² = 851931145854130322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 652660381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (652660387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326330190 + 326330191.

It is an arithmetic number, because the mean of its divisors is an integer number (326330191).

Almost surely, 2^652660381 is an apocalyptic number.

It is an amenable number.

652660381 is a deficient number, since it is larger than the sum of its proper divisors (1).

652660381 is an equidigital number, since it uses as much as digits as its factorization.

652660381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 652660381 is about 25547.2186548751. The cubic root of 652660381 is about 867.4193048931.

The spelling of 652660381 in words is "six hundred fifty-two million, six hundred sixty thousand, three hundred eighty-one".