201981154 has 8 divisors (see below), whose sum is σ = 303037020. Its totient is φ = 100968816.

The previous prime is 201981149. The next prime is 201981161. The reversal of 201981154 is 451189102.

It is a happy number.

201981154 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 175695025 + 26286129 = 13255^2 + 5127^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 5892 + ... + 20944.

Almost surely, 2^201981154 is an apocalyptic number.

201981154 is a deficient number, since it is larger than the sum of its proper divisors (101055866).

201981154 is a wasteful number, since it uses less digits than its factorization.

201981154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21764.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 201981154 is about 14212.0073881208. The cubic root of 201981154 is about 586.7281830437.

The spelling of 201981154 in words is "two hundred one million, nine hundred eighty-one thousand, one hundred fifty-four".