261321352 has 8 divisors (see below), whose sum is σ = 489977550. Its totient is φ = 130660672.

The previous prime is 261321341. The next prime is 261321397. The reversal of 261321352 is 253123162.

261321352 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 254530116 + 6791236 = 15954^2 + 2606^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×261321352² = 136577698022215808, which contains 22 as substring.

It is a plaindrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16332577 + ... + 16332592.

Almost surely, 2^261321352 is an apocalyptic number.

It is an amenable number.

261321352 is a deficient number, since it is larger than the sum of its proper divisors (228656198).

261321352 is a wasteful number, since it uses less digits than its factorization.

261321352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32665175 (or 32665171 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

The square root of 261321352 is about 16165.4369566678. The cubic root of 261321352 is about 639.3298258177.

The spelling of 261321352 in words is "two hundred sixty-one million, three hundred twenty-one thousand, three hundred fifty-two".