261003132 has 72 divisors (see below), whose sum is σ = 735047040. Its totient is φ = 77535360.

The previous prime is 261003109. The next prime is 261003157. The reversal of 261003132 is 231300162.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3957 + ... + 23187.

Almost surely, 2^261003132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261003132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (367523520).

261003132 is an abundant number, since it is smaller than the sum of its proper divisors (474043908).

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

261003132 is a wasteful number, since it uses less digits than its factorization.

261003132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19283 (or 19278 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 261003132 is about 16155.5913540792. The cubic root of 261003132 is about 639.0702091003.

Adding to 261003132 its reverse (231300162), we get a palindrome (492303294).

The spelling of 261003132 in words is "two hundred sixty-one million, three thousand, one hundred thirty-two".