197519661 has 8 divisors (see below), whose sum is σ = 292621760. Its totient is φ = 131679756.

The previous prime is 197519633. The next prime is 197519717. The reversal of 197519661 is 166915791.

It is not a de Polignac number, because 197519661 - 2⁵ = 197519629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197589661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3657745 + ... + 3657798.

It is an arithmetic number, because the mean of its divisors is an integer number (36577720).

Almost surely, 2^197519661 is an apocalyptic number.

It is an amenable number.

197519661 is a deficient number, since it is larger than the sum of its proper divisors (95102099).

197519661 is an equidigital number, since it uses as much as digits as its factorization.

197519661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7315552 (or 7315546 counting only the distinct ones).

The product of its digits is 102060, while the sum is 45.

The square root of 197519661 is about 14054.1688121354. The cubic root of 197519661 is about 582.3759660264.

The spelling of 197519661 in words is "one hundred ninety-seven million, five hundred nineteen thousand, six hundred sixty-one".