148609381 has 4 divisors (see below), whose sum is σ = 153403264. Its totient is φ = 143815500.

The previous prime is 148609367. The next prime is 148609387. The reversal of 148609381 is 183906841.

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 148609381 - 2⁹ = 148608869 is a prime.

It is a super-2 number, since 2×148609381² = 44169496242406322, 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 (148609387) 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, 2396895 + ... + 2396956.

It is an arithmetic number, because the mean of its divisors is an integer number (38350816).

Almost surely, 2^148609381 is an apocalyptic number.

It is an amenable number.

148609381 is a deficient number, since it is larger than the sum of its proper divisors (4793883).

148609381 is an equidigital number, since it uses as much as digits as its factorization.

148609381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4793882.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 148609381 is about 12190.5447376235. The cubic root of 148609381 is about 529.6822362451.

The spelling of 148609381 in words is "one hundred forty-eight million, six hundred nine thousand, three hundred eighty-one".