197151261 has 16 divisors (see below), whose sum is σ = 278640000. Its totient is φ = 123565568.

The previous prime is 197151257. The next prime is 197151263. The reversal of 197151261 is 162151791.

It is a cyclic number.

It is not a de Polignac number, because 197151261 - 2² = 197151257 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197151263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64240 + ... + 67238.

It is an arithmetic number, because the mean of its divisors is an integer number (17415000).

Almost surely, 2^197151261 is an apocalyptic number.

It is an amenable number.

197151261 is a deficient number, since it is larger than the sum of its proper divisors (81488739).

197151261 is a wasteful number, since it uses less digits than its factorization.

197151261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4308.

The product of its digits is 3780, while the sum is 33.

The square root of 197151261 is about 14041.0562636861. The cubic root of 197151261 is about 582.0136715769.

The spelling of 197151261 in words is "one hundred ninety-seven million, one hundred fifty-one thousand, two hundred sixty-one".