1981101154 has 16 divisors (see below), whose sum is σ = 3147524568. Its totient is φ = 931965952.

The previous prime is 1981101119. The next prime is 1981101173. The reversal of 1981101154 is 4511011891.

It can be written as a sum of positive squares in 4 ways, for example, as 1920805929 + 60295225 = 43827^2 + 7765^2 .

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, 114054 + ... + 130270.

Almost surely, 2^1981101154 is an apocalyptic number.

1981101154 is a deficient number, since it is larger than the sum of its proper divisors (1166423414).

1981101154 is a wasteful number, since it uses less digits than its factorization.

1981101154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19829.

The product of its (nonzero) digits is 1440, while the sum is 31.

The square root of 1981101154 is about 44509.5625006582. The cubic root of 1981101154 is about 1255.9399748350.

The spelling of 1981101154 in words is "one billion, nine hundred eighty-one million, one hundred one thousand, one hundred fifty-four".