1081537999 has 2 divisors, whose sum is σ = 1081538000. Its totient is φ = 1081537998.

The previous prime is 1081537979. The next prime is 1081538041. The reversal of 1081537999 is 9997351801.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1081537999 - 2⁵ = 1081537967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1081537949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540768999 + 540769000.

It is an arithmetic number, because the mean of its divisors is an integer number (540769000).

Almost surely, 2^1081537999 is an apocalyptic number.

1081537999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081537999 is an equidigital number, since it uses as much as digits as its factorization.

1081537999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 52.

The square root of 1081537999 is about 32886.7450350441. The cubic root of 1081537999 is about 1026.4723631677.

The spelling of 1081537999 in words is "one billion, eighty-one million, five hundred thirty-seven thousand, nine hundred ninety-nine".