148778431 has 4 divisors (see below), whose sum is σ = 148915152. Its totient is φ = 148641712.

The previous prime is 148778389. The next prime is 148778447. The reversal of 148778431 is 134877841.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 148778431 - 2⁹ = 148777919 is a prime.

It is a super-2 number, since 2×148778431² = 44270043061643522, 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 (148778131) 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, 66715 + ... + 68908.

It is an arithmetic number, because the mean of its divisors is an integer number (37228788).

Almost surely, 2^148778431 is an apocalyptic number.

148778431 is a deficient number, since it is larger than the sum of its proper divisors (136721).

148778431 is a wasteful number, since it uses less digits than its factorization.

148778431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136720.

The product of its digits is 150528, while the sum is 43.

The square root of 148778431 is about 12197.4764193254. The cubic root of 148778431 is about 529.8830060975.

The spelling of 148778431 in words is "one hundred forty-eight million, seven hundred seventy-eight thousand, four hundred thirty-one".