261552654 has 24 divisors (see below), whose sum is σ = 618215832. Its totient is φ = 79258320.

The previous prime is 261552631. The next prime is 261552677. The reversal of 261552654 is 456255162.

It is an interprime number because it is at equal distance from previous prime (261552631) and next prime (261552677).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 660289 + ... + 660684.

It is an arithmetic number, because the mean of its divisors is an integer number (25758993).

Almost surely, 2^261552654 is an apocalyptic number.

261552654 is an abundant number, since it is smaller than the sum of its proper divisors (356663178).

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

261552654 is a wasteful number, since it uses less digits than its factorization.

261552654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320992 (or 1320989 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 261552654 is about 16172.5895885600. The cubic root of 261552654 is about 639.5183990787.

The spelling of 261552654 in words is "two hundred sixty-one million, five hundred fifty-two thousand, six hundred fifty-four".