690514945 has 4 divisors (see below), whose sum is σ = 828617940. Its totient is φ = 552411952.

The previous prime is 690514943. The next prime is 690514963. The reversal of 690514945 is 549415096.

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 440622081 + 249892864 = 20991^2 + 15808^2 .

It is a cyclic number.

It is not a de Polignac number, because 690514945 - 2¹ = 690514943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (690514943) 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, 69051490 + ... + 69051499.

It is an arithmetic number, because the mean of its divisors is an integer number (207154485).

Almost surely, 2^690514945 is an apocalyptic number.

It is an amenable number.

690514945 is a deficient number, since it is larger than the sum of its proper divisors (138102995).

690514945 is a wasteful number, since it uses less digits than its factorization.

690514945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138102994.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 690514945 is about 26277.6510556024. The cubic root of 690514945 is about 883.8753607809.

The spelling of 690514945 in words is "six hundred ninety million, five hundred fourteen thousand, nine hundred forty-five".