149820797 has 4 divisors (see below), whose sum is σ = 171223776. Its totient is φ = 128417820.

The previous prime is 149820793. The next prime is 149820809. The reversal of 149820797 is 797028941.

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, and also an emirpimes, since its reverse is a distinct semiprime: 797028941 = 31 ⋅25710611.

It is a cyclic number.

It is not a de Polignac number, because 149820797 - 2² = 149820793 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 (149820793) 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, 10701479 + ... + 10701492.

It is an arithmetic number, because the mean of its divisors is an integer number (42805944).

Almost surely, 2^149820797 is an apocalyptic number.

It is an amenable number.

149820797 is a deficient number, since it is larger than the sum of its proper divisors (21402979).

149820797 is an equidigital number, since it uses as much as digits as its factorization.

149820797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21402978.

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 149820797 is about 12240.1305957085. The cubic root of 149820797 is about 531.1176096032.

The spelling of 149820797 in words is "one hundred forty-nine million, eight hundred twenty thousand, seven hundred ninety-seven".