11651557 has 2 divisors, whose sum is σ = 11651558. Its totient is φ = 11651556.

The previous prime is 11651539. The next prime is 11651561. The reversal of 11651557 is 75515611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11621281 + 30276 = 3409^2 + 174^2 .

It is a cyclic number.

It is not a de Polignac number, because 11651557 - 2²³ = 3262949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11651537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5825778 + 5825779.

It is an arithmetic number, because the mean of its divisors is an integer number (5825779).

Almost surely, 2^11651557 is an apocalyptic number.

It is an amenable number.

11651557 is a deficient number, since it is larger than the sum of its proper divisors (1).

11651557 is an equidigital number, since it uses as much as digits as its factorization.

11651557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5250, while the sum is 31.

The square root of 11651557 is about 3413.4377099927. The cubic root of 11651557 is about 226.7051162667.

The spelling of 11651557 in words is "eleven million, six hundred fifty-one thousand, five hundred fifty-seven".