261402245 has 16 divisors (see below), whose sum is σ = 352501632. Its totient is φ = 184641600.

The previous prime is 261402233. The next prime is 261402277. The reversal of 261402245 is 542204162.

It is not a de Polignac number, because 261402245 - 2¹² = 261398149 is a prime.

It is a super-2 number, since 2×261402245² = 136662267382080050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85931 + ... + 88920.

It is an arithmetic number, because the mean of its divisors is an integer number (22031352).

Almost surely, 2^261402245 is an apocalyptic number.

It is an amenable number.

261402245 is a deficient number, since it is larger than the sum of its proper divisors (91099387).

261402245 is a wasteful number, since it uses less digits than its factorization.

261402245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174892.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 261402245 is about 16167.9387987461. The cubic root of 261402245 is about 639.3957879899.

The spelling of 261402245 in words is "two hundred sixty-one million, four hundred two thousand, two hundred forty-five".