261465534 has 24 divisors (see below), whose sum is σ = 618009912. Its totient is φ = 79231920.

The previous prime is 261465527. The next prime is 261465539. The reversal of 261465534 is 435564162.

261465534 is a `hidden beast` number, since 2 + 61 + 4 + 65 + 534 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261465539) 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, 660069 + ... + 660464.

It is an arithmetic number, because the mean of its divisors is an integer number (25750413).

Almost surely, 2^261465534 is an apocalyptic number.

261465534 is an abundant number, since it is smaller than the sum of its proper divisors (356544378).

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

261465534 is a wasteful number, since it uses less digits than its factorization.

261465534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320552 (or 1320549 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 261465534 is about 16169.8959180324. The cubic root of 261465534 is about 639.4473859332.

It can be divided in two parts, 2614655 and 34, that added together give a square (2614689 = 1617²).

The spelling of 261465534 in words is "two hundred sixty-one million, four hundred sixty-five thousand, five hundred thirty-four".