690948193 has 4 divisors (see below), whose sum is σ = 744098068. Its totient is φ = 637798320.

The previous prime is 690948157. The next prime is 690948197. The reversal of 690948193 is 391849096.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 445336609 + 245611584 = 21103^2 + 15672^2 .

It is a cyclic number.

It is not a de Polignac number, because 690948193 - 2⁹ = 690947681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690948197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26574918 + ... + 26574943.

It is an arithmetic number, because the mean of its divisors is an integer number (186024517).

Almost surely, 2^690948193 is an apocalyptic number.

It is an amenable number.

690948193 is a deficient number, since it is larger than the sum of its proper divisors (53149875).

690948193 is a wasteful number, since it uses less digits than its factorization.

690948193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53149874.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 690948193 is about 26285.8934221380. The cubic root of 690948193 is about 884.0601780078.

The spelling of 690948193 in words is "six hundred ninety million, nine hundred forty-eight thousand, one hundred ninety-three".