61831489 has 4 divisors (see below), whose sum is σ = 62142400. Its totient is φ = 61520580.

The previous prime is 61831487. The next prime is 61831507. The reversal of 61831489 is 98413816.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61831489 - 2¹ = 61831487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61831487) 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, 155157 + ... + 155554.

It is an arithmetic number, because the mean of its divisors is an integer number (15535600).

Almost surely, 2^61831489 is an apocalyptic number.

It is an amenable number.

61831489 is a deficient number, since it is larger than the sum of its proper divisors (310911).

61831489 is a wasteful number, since it uses less digits than its factorization.

61831489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310910.

The product of its digits is 41472, while the sum is 40.

The square root of 61831489 is about 7863.3001341676. The cubic root of 61831489 is about 395.4302612776.

The spelling of 61831489 in words is "sixty-one million, eight hundred thirty-one thousand, four hundred eighty-nine".