197631994 has 12 divisors (see below), whose sum is σ = 344847834. Its totient is φ = 84699384.

The previous prime is 197631991. The next prime is 197631997. The reversal of 197631994 is 499136791.

It is an interprime number because it is at equal distance from previous prime (197631991) and next prime (197631997).

It can be written as a sum of positive squares in only one way, i.e., 109516225 + 88115769 = 10465^2 + 9387^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (197631991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1008229 + ... + 1008424.

Almost surely, 2^197631994 is an apocalyptic number.

197631994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

197631994 is a deficient number, since it is larger than the sum of its proper divisors (147215840).

197631994 is a wasteful number, since it uses less digits than its factorization.

197631994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2016669 (or 2016662 counting only the distinct ones).

The product of its digits is 367416, while the sum is 49.

The square root of 197631994 is about 14058.1646739537. The cubic root of 197631994 is about 582.4863476818.

The spelling of 197631994 in words is "one hundred ninety-seven million, six hundred thirty-one thousand, nine hundred ninety-four".