156135421 has 16 divisors (see below), whose sum is σ = 172893168. Its totient is φ = 140083200.

The previous prime is 156135323. The next prime is 156135439. The reversal of 156135421 is 124531651.

It can be written as a sum of positive squares in 8 ways, for example, as 235225 + 155900196 = 485^2 + 12486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156135421 is a prime.

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 156135421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156135491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243261 + ... + 243901.

It is an arithmetic number, because the mean of its divisors is an integer number (10805823).

Almost surely, 2^156135421 is an apocalyptic number.

It is an amenable number.

156135421 is a deficient number, since it is larger than the sum of its proper divisors (16757747).

156135421 is a wasteful number, since it uses less digits than its factorization.

156135421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152.

The product of its digits is 3600, while the sum is 28.

The square root of 156135421 is about 12495.4159994776. The cubic root of 156135421 is about 538.4769853952.

The spelling of 156135421 in words is "one hundred fifty-six million, one hundred thirty-five thousand, four hundred twenty-one".