201978045 has 12 divisors (see below), whose sum is σ = 350095356. Its totient is φ = 107721600.

The previous prime is 201978043. The next prime is 201978059. The reversal of 201978045 is 540879102.

201978045 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 59629284 + 142348761 = 7722^2 + 11931^2 .

It is not a de Polignac number, because 201978045 - 2¹ = 201978043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201978043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2244156 + ... + 2244245.

It is an arithmetic number, because the mean of its divisors is an integer number (29174613).

Almost surely, 2^201978045 is an apocalyptic number.

It is an amenable number.

201978045 is a deficient number, since it is larger than the sum of its proper divisors (148117311).

201978045 is a wasteful number, since it uses less digits than its factorization.

201978045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4488412 (or 4488409 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 201978045 is about 14211.8980083591. The cubic root of 201978045 is about 586.7251726188.

The spelling of 201978045 in words is "two hundred one million, nine hundred seventy-eight thousand, forty-five".