1230131998 has 4 divisors (see below), whose sum is σ = 1845198000. Its totient is φ = 615065998.

The previous prime is 1230131971. The next prime is 1230131999. The reversal of 1230131998 is 8991310321.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1230131999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307532998 + ... + 307533001.

It is an arithmetic number, because the mean of its divisors is an integer number (461299500).

Almost surely, 2^1230131998 is an apocalyptic number.

1230131998 is a deficient number, since it is larger than the sum of its proper divisors (615066002).

1230131998 is an equidigital number, since it uses as much as digits as its factorization.

1230131998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615066001.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 1230131998 is about 35073.2376321320. The cubic root of 1230131998 is about 1071.4795957195.

The spelling of 1230131998 in words is "one billion, two hundred thirty million, one hundred thirty-one thousand, nine hundred ninety-eight".