153121540 has 96 divisors (see below), whose sum is σ = 388249344. Its totient is φ = 49973760.

The previous prime is 153121523. The next prime is 153121541. The reversal of 153121540 is 45121351.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (153121541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105097 + ... + 106543.

It is an arithmetic number, because the mean of its divisors is an integer number (4044264).

Almost surely, 2^153121540 is an apocalyptic number.

153121540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 153121540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194124672).

153121540 is an abundant number, since it is smaller than the sum of its proper divisors (235127804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

153121540 is a wasteful number, since it uses less digits than its factorization.

153121540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517 (or 1515 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 153121540 is about 12374.2288648627. The cubic root of 153121540 is about 534.9897106939.

Adding to 153121540 its reverse (45121351), we get a palindrome (198242891).

The spelling of 153121540 in words is "one hundred fifty-three million, one hundred twenty-one thousand, five hundred forty".