153977381 has 4 divisors (see below), whose sum is σ = 163034892. Its totient is φ = 144919872.

The previous prime is 153977377. The next prime is 153977393. The reversal of 153977381 is 183779351.

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 65448100 + 88529281 = 8090^2 + 9409^2 .

It is a cyclic number.

It is not a de Polignac number, because 153977381 - 2² = 153977377 is a prime.

It is a super-2 number, since 2×153977381² = 47418067719238322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (153977321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4528730 + ... + 4528763.

It is an arithmetic number, because the mean of its divisors is an integer number (40758723).

Almost surely, 2^153977381 is an apocalyptic number.

It is an amenable number.

153977381 is a deficient number, since it is larger than the sum of its proper divisors (9057511).

153977381 is an equidigital number, since it uses as much as digits as its factorization.

153977381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9057510.

The product of its digits is 158760, while the sum is 44.

The square root of 153977381 is about 12408.7622670434. The cubic root of 153977381 is about 535.9845973242.

The spelling of 153977381 in words is "one hundred fifty-three million, nine hundred seventy-seven thousand, three hundred eighty-one".