761742109 has 4 divisors (see below), whose sum is σ = 763394940. Its totient is φ = 760089280.

The previous prime is 761742077. The next prime is 761742143. The reversal of 761742109 is 901247167.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 901247167 = 317 ⋅2843051.

It can be written as a sum of positive squares in 2 ways, for example, as 81054009 + 680688100 = 9003^2 + 26090^2 .

It is a cyclic number.

It is not a de Polignac number, because 761742109 - 2⁵ = 761742077 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 (761742169) 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, 825724 + ... + 826645.

It is an arithmetic number, because the mean of its divisors is an integer number (190848735).

Almost surely, 2^761742109 is an apocalyptic number.

It is an amenable number.

761742109 is a deficient number, since it is larger than the sum of its proper divisors (1652831).

761742109 is a wasteful number, since it uses less digits than its factorization.

761742109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652830.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 761742109 is about 27599.6758857781. The cubic root of 761742109 is about 913.2772821405.

The spelling of 761742109 in words is "seven hundred sixty-one million, seven hundred forty-two thousand, one hundred nine".