191518051 has 2 divisors, whose sum is σ = 191518052. Its totient is φ = 191518050.

The previous prime is 191518049. The next prime is 191518057. The reversal of 191518051 is 150815191.

191518051 = T₁₁₂₉₈ + T₁₁₂₉₉ + T₁₁₃₀₀.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 191518051 - 2¹ = 191518049 is a prime.

Together with 191518049, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_10634881 and since 191518051 and 10634881 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (191518057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95759025 + 95759026.

It is an arithmetic number, because the mean of its divisors is an integer number (95759026).

Almost surely, 2^191518051 is an apocalyptic number.

191518051 is the 11300-th centered triangular number.

191518051 is a deficient number, since it is larger than the sum of its proper divisors (1).

191518051 is an equidigital number, since it uses as much as digits as its factorization.

191518051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 31.

The square root of 191518051 is about 13839.0046968704. The cubic root of 191518051 is about 576.4167217724.

The spelling of 191518051 in words is "one hundred ninety-one million, five hundred eighteen thousand, fifty-one".