61801959 has 4 divisors (see below), whose sum is σ = 82402616. Its totient is φ = 41201304.

The previous prime is 61801921. The next prime is 61801979. The reversal of 61801959 is 95910816.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61801959 - 2⁹ = 61801447 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 (61801979) 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, 10300324 + ... + 10300329.

It is an arithmetic number, because the mean of its divisors is an integer number (20600654).

Almost surely, 2^61801959 is an apocalyptic number.

61801959 is a deficient number, since it is larger than the sum of its proper divisors (20600657).

61801959 is a wasteful number, since it uses less digits than its factorization.

61801959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20600656.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 61801959 is about 7861.4221995769. The cubic root of 61801959 is about 395.3673002888.

The spelling of 61801959 in words is "sixty-one million, eight hundred one thousand, nine hundred fifty-nine".