690341991 has 8 divisors (see below), whose sum is σ = 968901120. Its totient is φ = 436005432.

The previous prime is 690341989. The next prime is 690342011. The reversal of 690341991 is 199143096.

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

It is not a de Polignac number, because 690341991 - 2¹ = 690341989 is a prime.

It is a super-3 number, since 3×690341991³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690341291) 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, 6055575 + ... + 6055688.

It is an arithmetic number, because the mean of its divisors is an integer number (121112640).

Almost surely, 2^690341991 is an apocalyptic number.

690341991 is a deficient number, since it is larger than the sum of its proper divisors (278559129).

690341991 is a wasteful number, since it uses less digits than its factorization.

690341991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12111285.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 690341991 is about 26274.3599541454. The cubic root of 690341991 is about 883.8015595571.

The spelling of 690341991 in words is "six hundred ninety million, three hundred forty-one thousand, nine hundred ninety-one".