236491421 has 2 divisors, whose sum is σ = 236491422. Its totient is φ = 236491420.

The previous prime is 236491417. The next prime is 236491427. The reversal of 236491421 is 124194632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 184579396 + 51912025 = 13586^2 + 7205^2 .

It is a cyclic number.

It is not a de Polignac number, because 236491421 - 2² = 236491417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (236491427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 118245710 + 118245711.

It is an arithmetic number, because the mean of its divisors is an integer number (118245711).

Almost surely, 2^236491421 is an apocalyptic number.

It is an amenable number.

236491421 is a deficient number, since it is larger than the sum of its proper divisors (1).

236491421 is an equidigital number, since it uses as much as digits as its factorization.

236491421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 236491421 is about 15378.2775693509. The cubic root of 236491421 is about 618.4032978488.

The spelling of 236491421 in words is "two hundred thirty-six million, four hundred ninety-one thousand, four hundred twenty-one".