1991230301 has 4 divisors (see below), whose sum is σ = 1991922912. Its totient is φ = 1990537692.

The previous prime is 1991230279. The next prime is 1991230337. The reversal of 1991230301 is 1030321991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1991230301 - 2⁶ = 1991230237 is a prime.

It is a super-2 number, since 2×1991230301² = 7929996223241101202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1991230361) 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, 341975 + ... + 347748.

It is an arithmetic number, because the mean of its divisors is an integer number (497980728).

Almost surely, 2^1991230301 is an apocalyptic number.

It is an amenable number.

1991230301 is a deficient number, since it is larger than the sum of its proper divisors (692611).

1991230301 is an equidigital number, since it uses as much as digits as its factorization.

1991230301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692610.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 1991230301 is about 44623.2036165043. The cubic root of 1991230301 is about 1258.0768303256.

The spelling of 1991230301 in words is "one billion, nine hundred ninety-one million, two hundred thirty thousand, three hundred one".