77251 has 4 divisors (see below), whose sum is σ = 78472. Its totient is φ = 76032.

The previous prime is 77249. The next prime is 77261. The reversal of 77251 is 15277.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77251 - 2¹ = 77249 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 (77201) 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, 510 + ... + 643.

It is an arithmetic number, because the mean of its divisors is an integer number (19618).

2⁷⁷²⁵¹ is an apocalyptic number.

77251 is a deficient number, since it is larger than the sum of its proper divisors (1221).

77251 is a wasteful number, since it uses less digits than its factorization.

77251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220.

The product of its digits is 490, while the sum is 22.

The square root of 77251 is about 277.9406411448. The cubic root of 77251 is about 42.5893851163.

The spelling of 77251 in words is "seventy-seven thousand, two hundred fifty-one".