261402351 has 8 divisors (see below), whose sum is σ = 398327424. Its totient is φ = 149372760.

The previous prime is 261402343. The next prime is 261402359. The reversal of 261402351 is 153204162.

It is an interprime number because it is at equal distance from previous prime (261402343) and next prime (261402359).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261402351 - 2³ = 261402343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261402359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6223845 + ... + 6223886.

It is an arithmetic number, because the mean of its divisors is an integer number (49790928).

Almost surely, 2^261402351 is an apocalyptic number.

261402351 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

261402351 is a deficient number, since it is larger than the sum of its proper divisors (136925073).

261402351 is a wasteful number, since it uses less digits than its factorization.

261402351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12447741.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 261402351 is about 16167.9420768384. The cubic root of 261402351 is about 639.3958744161.

The spelling of 261402351 in words is "two hundred sixty-one million, four hundred two thousand, three hundred fifty-one".