1201640009 has 16 divisors (see below), whose sum is σ = 1323622080. Its totient is φ = 1086696000.

The previous prime is 1201639987. The next prime is 1201640021. The reversal of 1201640009 is 9000461021.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1201640009 - 2²⁴ = 1184862793 is a prime.

It is a super-2 number, since 2×1201640009² = 2887877422459040162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1201645009) 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, 21134 + ... + 53384.

It is an arithmetic number, because the mean of its divisors is an integer number (82726380).

Almost surely, 2^1201640009 is an apocalyptic number.

1201640009 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1201640009 is a deficient number, since it is larger than the sum of its proper divisors (121982071).

1201640009 is a wasteful number, since it uses less digits than its factorization.

1201640009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32360.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1201640009 is about 34664.6795600363. The cubic root of 1201640009 is about 1063.1424514845.

It can be divided in two parts, 12016 and 40009, that added together give a palindrome (52025).

The spelling of 1201640009 in words is "one billion, two hundred one million, six hundred forty thousand, nine".