153961987 has 4 divisors (see below), whose sum is σ = 156486016. Its totient is φ = 151437960.

The previous prime is 153961981. The next prime is 153961991. The reversal of 153961987 is 789169351.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 153961987 - 2¹⁵ = 153929219 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 153961987.

It is not an unprimeable number, because it can be changed into a prime (153961981) 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, 1261923 + ... + 1262044.

It is an arithmetic number, because the mean of its divisors is an integer number (39121504).

Almost surely, 2^153961987 is an apocalyptic number.

153961987 is a deficient number, since it is larger than the sum of its proper divisors (2524029).

153961987 is an equidigital number, since it uses as much as digits as its factorization.

153961987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2524028.

The product of its digits is 408240, while the sum is 49.

The square root of 153961987 is about 12408.1419640493. The cubic root of 153961987 is about 535.9667349130.

The spelling of 153961987 in words is "one hundred fifty-three million, nine hundred sixty-one thousand, nine hundred eighty-seven".