2158499477 has 2 divisors, whose sum is σ = 2158499478. Its totient is φ = 2158499476.

The previous prime is 2158499459. The next prime is 2158499507. The reversal of 2158499477 is 7749948512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1365006916 + 793492561 = 36946^2 + 28169^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2158499477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2158499437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079249738 + 1079249739.

It is an arithmetic number, because the mean of its divisors is an integer number (1079249739).

Almost surely, 2^2158499477 is an apocalyptic number.

It is an amenable number.

2158499477 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158499477 is an equidigital number, since it uses as much as digits as its factorization.

2158499477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 56.

The square root of 2158499477 is about 46459.6542927302. The cubic root of 2158499477 is about 1292.3614133078.

The spelling of 2158499477 in words is "two billion, one hundred fifty-eight million, four hundred ninety-nine thousand, four hundred seventy-seven".