869621761 has 2 divisors, whose sum is σ = 869621762. Its totient is φ = 869621760.

The previous prime is 869621747. The next prime is 869621801. The reversal of 869621761 is 167126968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 448592400 + 421029361 = 21180^2 + 20519^2 .

It is a cyclic number.

It is not a de Polignac number, because 869621761 - 2¹¹ = 869619713 is a prime.

It is a super-2 number, since 2×869621761² = 1512484014409482242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (869621741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434810880 + 434810881.

It is an arithmetic number, because the mean of its divisors is an integer number (434810881).

Almost surely, 2^869621761 is an apocalyptic number.

It is an amenable number.

869621761 is a deficient number, since it is larger than the sum of its proper divisors (1).

869621761 is an equidigital number, since it uses as much as digits as its factorization.

869621761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 869621761 is about 29489.3499589258. The cubic root of 869621761 is about 954.5019052188.

The spelling of 869621761 in words is "eight hundred sixty-nine million, six hundred twenty-one thousand, seven hundred sixty-one".