61642999 has 16 divisors (see below), whose sum is σ = 69428736. Its totient is φ = 54237600.

The previous prime is 61642993. The next prime is 61643033. The reversal of 61642999 is 99924616.

It is a cyclic number.

It is not a de Polignac number, because 61642999 - 2¹¹ = 61640951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61642993) 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, 126334 + ... + 126820.

It is an arithmetic number, because the mean of its divisors is an integer number (4339296).

Almost surely, 2^61642999 is an apocalyptic number.

61642999 is a deficient number, since it is larger than the sum of its proper divisors (7785737).

61642999 is a wasteful number, since it uses less digits than its factorization.

61642999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846.

The product of its digits is 209952, while the sum is 46.

The square root of 61642999 is about 7851.3055602237. The cubic root of 61642999 is about 395.0280362517.

The spelling of 61642999 in words is "sixty-one million, six hundred forty-two thousand, nine hundred ninety-nine".