61840651 has 4 divisors (see below), whose sum is σ = 61856704. Its totient is φ = 61824600.

The previous prime is 61840591. The next prime is 61840657. The reversal of 61840651 is 15604816.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a 3-Lehmer number, since φ(61840651) divides (61840651-1)³.

It is a cyclic number.

It is not a de Polignac number, because 61840651 - 2⁷ = 61840523 is a prime.

It is a super-2 number, since 2×61840651² = 7648532232207602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61840657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1606 + ... + 11236.

It is an arithmetic number, because the mean of its divisors is an integer number (15464176).

Almost surely, 2^61840651 is an apocalyptic number.

61840651 is the 6421-st pentagonal number.

61840651 is a deficient number, since it is larger than the sum of its proper divisors (16053).

61840651 is an equidigital number, since it uses as much as digits as its factorization.

61840651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16052.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 61840651 is about 7863.8826924109. The cubic root of 61840651 is about 395.4497915265.

The spelling of 61840651 in words is "sixty-one million, eight hundred forty thousand, six hundred fifty-one".