769531261 has 4 divisors (see below), whose sum is σ = 774432892. Its totient is φ = 764629632.

The previous prime is 769531249. The next prime is 769531283. The reversal of 769531261 is 162135967.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162135967 = 7 ⋅23162281.

It can be written as a sum of positive squares in 2 ways, for example, as 360278361 + 409252900 = 18981^2 + 20230^2 .

It is a cyclic number.

It is not a de Polignac number, because 769531261 - 2¹⁵ = 769498493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (769531201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2450580 + ... + 2450893.

It is an arithmetic number, because the mean of its divisors is an integer number (193608223).

Almost surely, 2^769531261 is an apocalyptic number.

It is an amenable number.

769531261 is a deficient number, since it is larger than the sum of its proper divisors (4901631).

769531261 is a wasteful number, since it uses less digits than its factorization.

769531261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4901630.

The product of its digits is 68040, while the sum is 40.

The square root of 769531261 is about 27740.4264747318. The cubic root of 769531261 is about 916.3796206395.

The spelling of 769531261 in words is "seven hundred sixty-nine million, five hundred thirty-one thousand, two hundred sixty-one".