861501349 has 2 divisors, whose sum is σ = 861501350. Its totient is φ = 861501348.

The previous prime is 861501341. The next prime is 861501359. The reversal of 861501349 is 943105168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 836250724 + 25250625 = 28918^2 + 5025^2 .

It is a cyclic number.

It is not a de Polignac number, because 861501349 - 2³ = 861501341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861501341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430750674 + 430750675.

It is an arithmetic number, because the mean of its divisors is an integer number (430750675).

Almost surely, 2^861501349 is an apocalyptic number.

It is an amenable number.

861501349 is a deficient number, since it is larger than the sum of its proper divisors (1).

861501349 is an equidigital number, since it uses as much as digits as its factorization.

861501349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 861501349 is about 29351.3432230963. The cubic root of 861501349 is about 951.5216055105.

The spelling of 861501349 in words is "eight hundred sixty-one million, five hundred one thousand, three hundred forty-nine".