145878961 has 4 divisors (see below), whose sum is σ = 150909300. Its totient is φ = 140848624.

The previous prime is 145878937. The next prime is 145878973. The reversal of 145878961 is 169878541.

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

It can be written as a sum of positive squares in 2 ways, for example, as 110250000 + 35628961 = 10500^2 + 5969^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145878961 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145878911) 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, 2515126 + ... + 2515183.

It is an arithmetic number, because the mean of its divisors is an integer number (37727325).

Almost surely, 2^145878961 is an apocalyptic number.

It is an amenable number.

145878961 is a deficient number, since it is larger than the sum of its proper divisors (5030339).

145878961 is an equidigital number, since it uses as much as digits as its factorization.

145878961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5030338.

The product of its digits is 483840, while the sum is 49.

The square root of 145878961 is about 12078.0363056252. The cubic root of 145878961 is about 526.4181894616.

The spelling of 145878961 in words is "one hundred forty-five million, eight hundred seventy-eight thousand, nine hundred sixty-one".