1011555531240 has 32 divisors (see below), whose sum is σ = 3034666594080. Its totient is φ = 269748141632.

The previous prime is 1011555531229. The next prime is 1011555531251. The reversal of 1011555531240 is 421355551101.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1011555531229) and next prime (1011555531251).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4214814594 + ... + 4214814833.

It is an arithmetic number, because the mean of its divisors is an integer number (94833331065).

Almost surely, 2^{1011555531240} is an apocalyptic number.

1011555531240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011555531240 is an abundant number, since it is smaller than the sum of its proper divisors (2023111062840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1011555531240 is a wasteful number, since it uses less digits than its factorization.

1011555531240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8429629441 (or 8429629437 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 33.

The spelling of 1011555531240 in words is "one trillion, eleven billion, five hundred fifty-five million, five hundred thirty-one thousand, two hundred forty".