154992197 has 4 divisors (see below), whose sum is σ = 156212736. Its totient is φ = 153771660.

The previous prime is 154992191. The next prime is 154992209. The reversal of 154992197 is 791299451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 154992197 - 2⁴ = 154992181 is a prime.

It is a super-2 number, since 2×154992197² = 48045162261773618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154992191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 610079 + ... + 610332.

It is an arithmetic number, because the mean of its divisors is an integer number (39053184).

Almost surely, 2^154992197 is an apocalyptic number.

It is an amenable number.

154992197 is a deficient number, since it is larger than the sum of its proper divisors (1220539).

154992197 is a wasteful number, since it uses less digits than its factorization.

154992197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220538.

The product of its digits is 204120, while the sum is 47.

The square root of 154992197 is about 12449.5862180235. The cubic root of 154992197 is about 537.1595213086.

The spelling of 154992197 in words is "one hundred fifty-four million, nine hundred ninety-two thousand, one hundred ninety-seven".