102001554 has 24 divisors (see below), whose sum is σ = 221363532. Its totient is φ = 33945120.

The previous prime is 102001553. The next prime is 102001567. The reversal of 102001554 is 455100201.

It can be written as a sum of positive squares in 2 ways, for example, as 101545929 + 455625 = 10077^2 + 675^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

102001554 is a modest number, since divided by 1554 gives 102 as remainder.

It is not an unprimeable number, because it can be changed into a prime (102001553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7612 + ... + 16184.

Almost surely, 2^102001554 is an apocalyptic number.

102001554 is an abundant number, since it is smaller than the sum of its proper divisors (119361978).

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

102001554 is a wasteful number, since it uses less digits than its factorization.

102001554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9242 (or 9239 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 102001554 is about 10099.5818725331. The cubic root of 102001554 is about 467.2352456336.

Adding to 102001554 its reverse (455100201), we get a palindrome (557101755).

The spelling of 102001554 in words is "one hundred two million, one thousand, five hundred fifty-four".