147421661 has 8 divisors (see below), whose sum is σ = 148307640. Its totient is φ = 146539008.

The previous prime is 147421649. The next prime is 147421669. The reversal of 147421661 is 166124741.

It can be written as a sum of positive squares in 4 ways, for example, as 8323225 + 139098436 = 2885^2 + 11794^2 .

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 147421661 - 2⁶ = 147421597 is a prime.

It is a super-2 number, since 2×147421661² = 43466292263997842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147421669) 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, 207575 + ... + 208283.

It is an arithmetic number, because the mean of its divisors is an integer number (18538455).

Almost surely, 2^147421661 is an apocalyptic number.

It is an amenable number.

147421661 is a deficient number, since it is larger than the sum of its proper divisors (885979).

147421661 is an equidigital number, since it uses as much as digits as its factorization.

147421661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1663.

The product of its digits is 8064, while the sum is 32.

The square root of 147421661 is about 12141.7322075559. The cubic root of 147421661 is about 528.2673464831.

The spelling of 147421661 in words is "one hundred forty-seven million, four hundred twenty-one thousand, six hundred sixty-one".