61011559 has 4 divisors (see below), whose sum is σ = 69727504. Its totient is φ = 52295616.

The previous prime is 61011553. The next prime is 61011569. The reversal of 61011559 is 95511016.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61011559 - 2¹¹ = 61009511 is a prime.

It is a super-2 number, since 2×61011559² = 7444820663220962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61011553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4357962 + ... + 4357975.

It is an arithmetic number, because the mean of its divisors is an integer number (17431876).

Almost surely, 2^61011559 is an apocalyptic number.

61011559 is a deficient number, since it is larger than the sum of its proper divisors (8715945).

61011559 is an equidigital number, since it uses as much as digits as its factorization.

61011559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8715944.

The product of its (nonzero) digits is 1350, while the sum is 28.

The square root of 61011559 is about 7810.9896300021. The cubic root of 61011559 is about 393.6745812048.

The spelling of 61011559 in words is "sixty-one million, eleven thousand, five hundred fifty-nine".