261651234 has 16 divisors (see below), whose sum is σ = 563556672. Its totient is φ = 80508048.

The previous prime is 261651211. The next prime is 261651251. The reversal of 261651234 is 432156162.

It is a super-2 number, since 2×261651234² = 136922736507445512, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1677174 + ... + 1677329.

It is an arithmetic number, because the mean of its divisors is an integer number (35222292).

Almost surely, 2^261651234 is an apocalyptic number.

261651234 is an abundant number, since it is smaller than the sum of its proper divisors (301905438).

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

261651234 is a wasteful number, since it uses less digits than its factorization.

261651234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3354521.

The product of its digits is 8640, while the sum is 30.

The square root of 261651234 is about 16175.6370508243. The cubic root of 261651234 is about 639.5987344708.

The spelling of 261651234 in words is "two hundred sixty-one million, six hundred fifty-one thousand, two hundred thirty-four".