145501978 has 4 divisors (see below), whose sum is σ = 218252970. Its totient is φ = 72750988.

The previous prime is 145501931. The next prime is 145501987. The reversal of 145501978 is 879105541.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 90193009 + 55308969 = 9497^2 + 7437^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 145501978.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36375493 + ... + 36375496.

Almost surely, 2^145501978 is an apocalyptic number.

145501978 is a deficient number, since it is larger than the sum of its proper divisors (72750992).

145501978 is an equidigital number, since it uses as much as digits as its factorization.

145501978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72750991.

The product of its (nonzero) digits is 50400, while the sum is 40.

The square root of 145501978 is about 12062.4200722741. The cubic root of 145501978 is about 525.9643385443.

The spelling of 145501978 in words is "one hundred forty-five million, five hundred one thousand, nine hundred seventy-eight".