215138299 has 2 divisors, whose sum is σ = 215138300. Its totient is φ = 215138298.

The previous prime is 215138291. The next prime is 215138323. The reversal of 215138299 is 992831512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215138299 - 2³ = 215138291 is a prime.

It is a super-2 number, since 2×215138299² = 92568975393226802, which contains 22 as substring.

It is equal to p_11869519 and since 215138299 and 11869519 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 (215138291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107569149 + 107569150.

It is an arithmetic number, because the mean of its divisors is an integer number (107569150).

Almost surely, 2^215138299 is an apocalyptic number.

215138299 is a deficient number, since it is larger than the sum of its proper divisors (1).

215138299 is an equidigital number, since it uses as much as digits as its factorization.

215138299 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 40.

The square root of 215138299 is about 14667.5934972306. The cubic root of 215138299 is about 599.2010653483.

The spelling of 215138299 in words is "two hundred fifteen million, one hundred thirty-eight thousand, two hundred ninety-nine".