690156909 has 16 divisors (see below), whose sum is σ = 1101105600. Its totient is φ = 424711728.

The previous prime is 690156889. The next prime is 690156983. The reversal of 690156909 is 909651096.

It is not a de Polignac number, because 690156909 - 2¹⁶ = 690091373 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690156109) 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, 982779 + ... + 983480.

It is an arithmetic number, because the mean of its divisors is an integer number (68819100).

Almost surely, 2^690156909 is an apocalyptic number.

It is an amenable number.

690156909 is a deficient number, since it is larger than the sum of its proper divisors (410948691).

690156909 is a wasteful number, since it uses less digits than its factorization.

690156909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966281 (or 1966275 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The square root of 690156909 is about 26270.8376151199. The cubic root of 690156909 is about 883.7225695382.

The spelling of 690156909 in words is "six hundred ninety million, one hundred fifty-six thousand, nine hundred nine".