181097397 has 32 divisors (see below), whose sum is σ = 289976960. Its totient is φ = 111041280.

The previous prime is 181097353. The next prime is 181097407. The reversal of 181097397 is 793790181.

It is not a de Polignac number, because 181097397 - 2¹⁵ = 181064629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181047397) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117522 + ... + 119052.

It is an arithmetic number, because the mean of its divisors is an integer number (9061780).

Almost surely, 2^181097397 is an apocalyptic number.

It is an amenable number.

181097397 is a deficient number, since it is larger than the sum of its proper divisors (108879563).

181097397 is a wasteful number, since it uses less digits than its factorization.

181097397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1890 (or 1884 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 45.

The square root of 181097397 is about 13457.2432912540. The cubic root of 181097397 is about 565.7667268223.

The spelling of 181097397 in words is "one hundred eighty-one million, ninety-seven thousand, three hundred ninety-seven".