201561034 has 4 divisors (see below), whose sum is σ = 302341554. Its totient is φ = 100780516.

The previous prime is 201561011. The next prime is 201561037. The reversal of 201561034 is 430165102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 430165102 = 2 ⋅215082551.

It can be written as a sum of positive squares in only one way, i.e., 151363809 + 50197225 = 12303^2 + 7085^2 .

It is a junction number, because it is equal to n+sod(n) for n = 201560996 and 201561014.

It is not an unprimeable number, because it can be changed into a prime (201561037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50390257 + ... + 50390260.

Almost surely, 2^201561034 is an apocalyptic number.

201561034 is a deficient number, since it is larger than the sum of its proper divisors (100780520).

201561034 is a wasteful number, since it uses less digits than its factorization.

201561034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100780519.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 201561034 is about 14197.2192347657. The cubic root of 201561034 is about 586.3211032397.

The spelling of 201561034 in words is "two hundred one million, five hundred sixty-one thousand, thirty-four".