1206400511 has 2 divisors, whose sum is σ = 1206400512. Its totient is φ = 1206400510.

The previous prime is 1206400499. The next prime is 1206400537. The reversal of 1206400511 is 1150046021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1206400511 - 2²² = 1202206207 is a prime.

It is a super-2 number, since 2×1206400511² = 2910804385882122242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1206400541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 603200255 + 603200256.

It is an arithmetic number, because the mean of its divisors is an integer number (603200256).

Almost surely, 2^1206400511 is an apocalyptic number.

1206400511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1206400511 is an equidigital number, since it uses as much as digits as its factorization.

1206400511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1206400511 is about 34733.2767098067. The cubic root of 1206400511 is about 1064.5445416669.

Adding to 1206400511 its reverse (1150046021), we get a palindrome (2356446532).

The spelling of 1206400511 in words is "one billion, two hundred six million, four hundred thousand, five hundred eleven".