61509011 has 2 divisors, whose sum is σ = 61509012. Its totient is φ = 61509010.

The previous prime is 61508999. The next prime is 61509013. The reversal of 61509011 is 11090516.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61509011 is a prime.

Together with 61509013, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61509013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30754505 + 30754506.

It is an arithmetic number, because the mean of its divisors is an integer number (30754506).

Almost surely, 2^61509011 is an apocalyptic number.

61509011 is a deficient number, since it is larger than the sum of its proper divisors (1).

61509011 is an equidigital number, since it uses as much as digits as its factorization.

61509011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 23.

The square root of 61509011 is about 7842.7680700120. The cubic root of 61509011 is about 394.7416159887.

Adding to 61509011 its reverse (11090516), we get a palindrome (72599527).

The spelling of 61509011 in words is "sixty-one million, five hundred nine thousand, eleven".