16961391 has 6 divisors (see below), whose sum is σ = 24499800. Its totient is φ = 11307588.

The previous prime is 16961389. The next prime is 16961411. The reversal of 16961391 is 19316961.

It is not a de Polignac number, because 16961391 - 2¹ = 16961389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16961311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 942291 + ... + 942308.

It is an arithmetic number, because the mean of its divisors is an integer number (4083300).

Almost surely, 2^16961391 is an apocalyptic number.

16961391 is a deficient number, since it is larger than the sum of its proper divisors (7538409).

16961391 is a wasteful number, since it uses less digits than its factorization.

16961391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1884605 (or 1884602 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 16961391 is about 4118.4209352615. The cubic root of 16961391 is about 256.9333554174.

The spelling of 16961391 in words is "sixteen million, nine hundred sixty-one thousand, three hundred ninety-one".