690044991 has 16 divisors (see below), whose sum is σ = 926650368. Its totient is φ = 456744800.

The previous prime is 690044981. The next prime is 690045007. The reversal of 690044991 is 199440096.

It is a cyclic number.

It is not a de Polignac number, because 690044991 - 2¹³ = 690036799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690044941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 455926 + ... + 457436.

It is an arithmetic number, because the mean of its divisors is an integer number (57915648).

Almost surely, 2^690044991 is an apocalyptic number.

690044991 is a deficient number, since it is larger than the sum of its proper divisors (236605377).

690044991 is a wasteful number, since it uses less digits than its factorization.

690044991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2502.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 690044991 is about 26268.7074482168. The cubic root of 690044991 is about 883.6747978851.

The spelling of 690044991 in words is "six hundred ninety million, forty-four thousand, nine hundred ninety-one".