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331661407 = 7114307291
BaseRepresentation
bin10011110001001…
…100000001011111
3212010002010220211
4103301030001133
51134401131112
652524353251
711135034610
oct2361140137
9763063824
10331661407
1116023a140
12930a5827
135393506c
1432095c07
151e1b50a7
hex13c4c05f

331661407 has 8 divisors (see below), whose sum is σ = 413500032. Its totient is φ = 258437400.

The previous prime is 331661399. The next prime is 331661413. The reversal of 331661407 is 704166133.

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

It is a cyclic number.

It is not a de Polignac number, because 331661407 - 23 = 331661399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331661417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2153569 + ... + 2153722.

It is an arithmetic number, because the mean of its divisors is an integer number (51687504).

Almost surely, 2331661407 is an apocalyptic number.

331661407 is a deficient number, since it is larger than the sum of its proper divisors (81838625).

331661407 is a wasteful number, since it uses less digits than its factorization.

331661407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4307309.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 331661407 is about 18211.5734355931. The cubic root of 331661407 is about 692.2000817797.

The spelling of 331661407 in words is "three hundred thirty-one million, six hundred sixty-one thousand, four hundred seven".

Divisors: 1 7 11 77 4307291 30151037 47380201 331661407