145428331 has 4 divisors (see below), whose sum is σ = 147812464. Its totient is φ = 143044200.

The previous prime is 145428329. The next prime is 145428341. The reversal of 145428331 is 133824541.

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 145428331 - 2¹ = 145428329 is a prime.

It is a super-2 number, since 2×145428331² = 42298798914891122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145428293 and 145428302.

It is not an unprimeable number, because it can be changed into a prime (145428341) 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, 1191975 + ... + 1192096.

It is an arithmetic number, because the mean of its divisors is an integer number (36953116).

Almost surely, 2^145428331 is an apocalyptic number.

145428331 is a deficient number, since it is larger than the sum of its proper divisors (2384133).

145428331 is an equidigital number, since it uses as much as digits as its factorization.

145428331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384132.

The product of its digits is 11520, while the sum is 31.

The square root of 145428331 is about 12059.3669402668. The cubic root of 145428331 is about 525.8755832035.

The spelling of 145428331 in words is "one hundred forty-five million, four hundred twenty-eight thousand, three hundred thirty-one".