1201139816 has 16 divisors (see below), whose sum is σ = 2252517540. Its totient is φ = 600468480.

The previous prime is 1201139791. The next prime is 1201139827. The reversal of 1201139816 is 6189311021.

It can be written as a sum of positive squares in 2 ways, for example, as 1200899716 + 240100 = 34654^2 + 490^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67400 + ... + 83336.

Almost surely, 2^1201139816 is an apocalyptic number.

It is an amenable number.

1201139816 is a deficient number, since it is larger than the sum of its proper divisors (1051377724).

1201139816 is a wasteful number, since it uses less digits than its factorization.

1201139816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25364 (or 25360 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 1201139816 is about 34657.4640734143. The cubic root of 1201139816 is about 1062.9949169454.

The spelling of 1201139816 in words is "one billion, two hundred one million, one hundred thirty-nine thousand, eight hundred sixteen".