61651899 has 6 divisors (see below), whose sum is σ = 89052756. Its totient is φ = 41101260.

The previous prime is 61651871. The next prime is 61651913. The reversal of 61651899 is 99815616.

It is a de Polignac number, because none of the positive numbers 2^k-61651899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61651829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3425097 + ... + 3425114.

It is an arithmetic number, because the mean of its divisors is an integer number (14842126).

Almost surely, 2^61651899 is an apocalyptic number.

61651899 is a deficient number, since it is larger than the sum of its proper divisors (27400857).

61651899 is a wasteful number, since it uses less digits than its factorization.

61651899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6850217 (or 6850214 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 61651899 is about 7851.8723244841. The cubic root of 61651899 is about 395.0470466849.

The spelling of 61651899 in words is "sixty-one million, six hundred fifty-one thousand, eight hundred ninety-nine".