261145152 has 42 divisors (see below), whose sum is σ = 748527078. Its totient is φ = 87048192.

The previous prime is 261145127. The next prime is 261145187. The reversal of 261145152 is 251541162.

261145152 is a `hidden beast` number, since 2 + 611 + 45 + 1 + 5 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 259338816 + 1806336 = 16104^2 + 1344^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 226113 + ... + 227264.

Almost surely, 2^261145152 is an apocalyptic number.

It is an amenable number.

261145152 is an abundant number, since it is smaller than the sum of its proper divisors (487381926).

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

261145152 is a wasteful number, since it uses less digits than its factorization.

261145152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453395 (or 453382 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 261145152 is about 16159.9861386079. The cubic root of 261145152 is about 639.1861008056.

The spelling of 261145152 in words is "two hundred sixty-one million, one hundred forty-five thousand, one hundred fifty-two".