147225781 has 8 divisors (see below), whose sum is σ = 148980384. Its totient is φ = 145477200.

The previous prime is 147225773. The next prime is 147225803. The reversal of 147225781 is 187522741.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 147225781 - 2³ = 147225773 is a prime.

It is a super-2 number, since 2×147225781² = 43350861182119922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 147225781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147225731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63810 + ... + 66076.

It is an arithmetic number, because the mean of its divisors is an integer number (18622548).

Almost surely, 2^147225781 is an apocalyptic number.

It is an amenable number.

147225781 is a deficient number, since it is larger than the sum of its proper divisors (1754603).

147225781 is a wasteful number, since it uses less digits than its factorization.

147225781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3011.

The product of its digits is 31360, while the sum is 37.

The square root of 147225781 is about 12133.6631319647. The cubic root of 147225781 is about 528.0332721706.

It can be divided in two parts, 14722 and 5781, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 147225781 in words is "one hundred forty-seven million, two hundred twenty-five thousand, seven hundred eighty-one".