261405130 has 64 divisors (see below), whose sum is σ = 565678080. Its totient is φ = 85075200.

The previous prime is 261405091. The next prime is 261405167. The reversal of 261405130 is 31504162.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122775 + ... + 124885.

It is an arithmetic number, because the mean of its divisors is an integer number (8838720).

Almost surely, 2^261405130 is an apocalyptic number.

261405130 is an abundant number, since it is smaller than the sum of its proper divisors (304272950).

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

261405130 is a wasteful number, since it uses less digits than its factorization.

261405130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 261405130 is about 16168.0280182835. The cubic root of 261405130 is about 639.3981402397.

Adding to 261405130 its reverse (31504162), we get a palindrome (292909292).

The spelling of 261405130 in words is "two hundred sixty-one million, four hundred five thousand, one hundred thirty".