77651 has 4 divisors (see below), whose sum is σ = 88752. Its totient is φ = 66552.

The previous prime is 77647. The next prime is 77659. The reversal of 77651 is 15677.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15677 = 61 ⋅257.

It is a cyclic number.

It is not a de Polignac number, because 77651 - 2² = 77647 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 77651.

It is not an unprimeable number, because it can be changed into a prime (77659) 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, 5540 + ... + 5553.

It is an arithmetic number, because the mean of its divisors is an integer number (22188).

2⁷⁷⁶⁵¹ is an apocalyptic number.

77651 is a deficient number, since it is larger than the sum of its proper divisors (11101).

77651 is a wasteful number, since it uses less digits than its factorization.

77651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11100.

The product of its digits is 1470, while the sum is 26.

The square root of 77651 is about 278.6592901735. The cubic root of 77651 is about 42.6627668419.

Adding to 77651 its sum of digits (26), we get a palindrome (77677).

The spelling of 77651 in words is "seventy-seven thousand, six hundred fifty-one".