1002231291 has 4 divisors (see below), whose sum is σ = 1336308392. Its totient is φ = 668154192.

The previous prime is 1002231287. The next prime is 1002231301. The reversal of 1002231291 is 1921322001.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1002231291 - 2² = 1002231287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1002233291) 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, 167038546 + ... + 167038551.

It is an arithmetic number, because the mean of its divisors is an integer number (334077098).

Almost surely, 2^1002231291 is an apocalyptic number.

1002231291 is a deficient number, since it is larger than the sum of its proper divisors (334077101).

1002231291 is an equidigital number, since it uses as much as digits as its factorization.

1002231291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334077100.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1002231291 is about 31658.0367521424. The cubic root of 1002231291 is about 1000.7432111670.

Adding to 1002231291 its reverse (1921322001), we get a palindrome (2923553292).

The spelling of 1002231291 in words is "one billion, two million, two hundred thirty-one thousand, two hundred ninety-one".