840456061 has 2 divisors, whose sum is σ = 840456062. Its totient is φ = 840456060.

The previous prime is 840456037. The next prime is 840456079. The reversal of 840456061 is 160654048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 510488836 + 329967225 = 22594^2 + 18165^2 .

It is a cyclic number.

It is not a de Polignac number, because 840456061 - 2¹⁵ = 840423293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840451061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420228030 + 420228031.

It is an arithmetic number, because the mean of its divisors is an integer number (420228031).

Almost surely, 2^840456061 is an apocalyptic number.

It is an amenable number.

840456061 is a deficient number, since it is larger than the sum of its proper divisors (1).

840456061 is an equidigital number, since it uses as much as digits as its factorization.

840456061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 840456061 is about 28990.6202244795. The cubic root of 840456061 is about 943.7095236006.

The spelling of 840456061 in words is "eight hundred forty million, four hundred fifty-six thousand, sixty-one".