61651099 has 2 divisors, whose sum is σ = 61651100. Its totient is φ = 61651098.

The previous prime is 61651069. The next prime is 61651103. The reversal of 61651099 is 99015616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61651099 - 2⁹ = 61650587 is a prime.

It is not a weakly prime, because it can be changed into another prime (61651019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30825549 + 30825550.

It is an arithmetic number, because the mean of its divisors is an integer number (30825550).

Almost surely, 2^61651099 is an apocalyptic number.

61651099 is a deficient number, since it is larger than the sum of its proper divisors (1).

61651099 is an equidigital number, since it uses as much as digits as its factorization.

61651099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 61651099 is about 7851.8213810555. The cubic root of 61651099 is about 395.0453379567.

It can be divided in two parts, 616 and 51099, that added together give a palindrome (51715).

The spelling of 61651099 in words is "sixty-one million, six hundred fifty-one thousand, ninety-nine".