99977651 has 2 divisors, whose sum is σ = 99977652. Its totient is φ = 99977650.

The previous prime is 99977641. The next prime is 99977653. The reversal of 99977651 is 15677999.

It is a strong prime.

It is an emirp because it is prime and its reverse (15677999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99977651 - 2¹⁸ = 99715507 is a prime.

Together with 99977653, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 99977593 and 99977602.

It is not a weakly prime, because it can be changed into another prime (99977653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49988825 + 49988826.

It is an arithmetic number, because the mean of its divisors is an integer number (49988826).

Almost surely, 2^99977651 is an apocalyptic number.

99977651 is a deficient number, since it is larger than the sum of its proper divisors (1).

99977651 is an equidigital number, since it uses as much as digits as its factorization.

99977651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1071630, while the sum is 53.

The square root of 99977651 is about 9998.8824875583. The cubic root of 99977651 is about 464.1243024954.

The spelling of 99977651 in words is "ninety-nine million, nine hundred seventy-seven thousand, six hundred fifty-one".