1197154861 has 24 divisors (see below), whose sum is σ = 1409835840. Its totient is φ = 995582016.

The previous prime is 1197154843. The next prime is 1197154867. The reversal of 1197154861 is 1684517911.

It is not a de Polignac number, because 1197154861 - 2²⁷ = 1062937133 is a prime.

It is a super-2 number, since 2×1197154861² = 2866359522431858642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1197154867) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2926825 + ... + 2927233.

It is an arithmetic number, because the mean of its divisors is an integer number (58743160).

Almost surely, 2^1197154861 is an apocalyptic number.

It is an amenable number.

1197154861 is a deficient number, since it is larger than the sum of its proper divisors (212680979).

1197154861 is an frugal number, since it uses more digits than its factorization.

1197154861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641 (or 562 counting only the distinct ones).

The product of its digits is 60480, while the sum is 43.

The square root of 1197154861 is about 34599.9257369145. The cubic root of 1197154861 is about 1061.8180680874.

The spelling of 1197154861 in words is "one billion, one hundred ninety-seven million, one hundred fifty-four thousand, eight hundred sixty-one".