77123261 has 4 divisors (see below), whose sum is σ = 81182400. Its totient is φ = 73064124.

The previous prime is 77123251. The next prime is 77123269. The reversal of 77123261 is 16232177.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77123261 - 2¹⁴ = 77106877 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 (77123269) 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, 2029541 + ... + 2029578.

It is an arithmetic number, because the mean of its divisors is an integer number (20295600).

Almost surely, 2^77123261 is an apocalyptic number.

It is an amenable number.

77123261 is a deficient number, since it is larger than the sum of its proper divisors (4059139).

77123261 is a wasteful number, since it uses less digits than its factorization.

77123261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4059138.

The product of its digits is 3528, while the sum is 29.

The square root of 77123261 is about 8781.9850261772. The cubic root of 77123261 is about 425.6589749438.

The spelling of 77123261 in words is "seventy-seven million, one hundred twenty-three thousand, two hundred sixty-one".