148915790921 has 4 divisors (see below), whose sum is σ = 153719526144. Its totient is φ = 144112055700.

The previous prime is 148915790873. The next prime is 148915790929. The reversal of 148915790921 is 129097519841.

It is a happy number.

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: 129097519841 = 709 ⋅182083949.

It is a cyclic number.

It is not a de Polignac number, because 148915790921 - 2¹⁴ = 148915774537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (148915790929) 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, 2401867565 + ... + 2401867626.

It is an arithmetic number, because the mean of its divisors is an integer number (38429881536).

Almost surely, 2^148915790921 is an apocalyptic number.

It is an amenable number.

148915790921 is a deficient number, since it is larger than the sum of its proper divisors (4803735223).

148915790921 is an equidigital number, since it uses as much as digits as its factorization.

148915790921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4803735222.

The product of its (nonzero) digits is 1632960, while the sum is 56.

The spelling of 148915790921 in words is "one hundred forty-eight billion, nine hundred fifteen million, seven hundred ninety thousand, nine hundred twenty-one".