155650421 has 4 divisors (see below), whose sum is σ = 155695212. Its totient is φ = 155605632.

The previous prime is 155650403. The next prime is 155650457. The reversal of 155650421 is 124056551.

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 2 ways, for example, as 9579025 + 146071396 = 3095^2 + 12086^2 .

It is a cyclic number.

It is not a de Polignac number, because 155650421 - 2⁶ = 155650357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155650471) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 16700 + ... + 24293.

It is an arithmetic number, because the mean of its divisors is an integer number (38923803).

Almost surely, 2^155650421 is an apocalyptic number.

It is an amenable number.

155650421 is a deficient number, since it is larger than the sum of its proper divisors (44791).

155650421 is an equidigital number, since it uses as much as digits as its factorization.

155650421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44790.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 155650421 is about 12475.9937880716. The cubic root of 155650421 is about 537.9188540476.

The spelling of 155650421 in words is "one hundred fifty-five million, six hundred fifty thousand, four hundred twenty-one".