2126151977 has 4 divisors (see below), whose sum is σ = 2126246100. Its totient is φ = 2126057856.

The previous prime is 2126151967. The next prime is 2126151997. The reversal of 2126151977 is 7791516212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1820216896 + 305935081 = 42664^2 + 17491^2 .

It is a cyclic number.

It is not a de Polignac number, because 2126151977 - 2⁴ = 2126151961 is a prime.

It is a deceptive number, since it divides R_2126151976.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2126151917) 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, 9413 + ... + 65885.

It is an arithmetic number, because the mean of its divisors is an integer number (531561525).

Almost surely, 2^2126151977 is an apocalyptic number.

2126151977 is the 37649-th pentagonal number.

It is an amenable number.

2126151977 is a deficient number, since it is larger than the sum of its proper divisors (94123).

2126151977 is an equidigital number, since it uses as much as digits as its factorization.

2126151977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94122.

The product of its digits is 52920, while the sum is 41.

The square root of 2126151977 is about 46110.2155384249. The cubic root of 2126151977 is about 1285.8730715772.

The spelling of 2126151977 in words is "two billion, one hundred twenty-six million, one hundred fifty-one thousand, nine hundred seventy-seven".