61520011 has 16 divisors (see below), whose sum is σ = 72679104. Its totient is φ = 50972544.

The previous prime is 61519999. The next prime is 61520029. The reversal of 61520011 is 11002516.

It is a happy number.

It is not a de Polignac number, because 61520011 - 2⁷ = 61519883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61520051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44121 + ... + 45493.

It is an arithmetic number, because the mean of its divisors is an integer number (4542444).

Almost surely, 2^61520011 is an apocalyptic number.

61520011 is a deficient number, since it is larger than the sum of its proper divisors (11159093).

61520011 is a wasteful number, since it uses less digits than its factorization.

61520011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 61520011 is about 7843.4693216714. The cubic root of 61520011 is about 394.7651458688.

Adding to 61520011 its reverse (11002516), we get a palindrome (72522527).

The spelling of 61520011 in words is "sixty-one million, five hundred twenty thousand, eleven".