61431789 has 4 divisors (see below), whose sum is σ = 81909056. Its totient is φ = 40954524.

The previous prime is 61431779. The next prime is 61431809. The reversal of 61431789 is 98713416.

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 not a de Polignac number, because 61431789 - 2⁵ = 61431757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61431709) 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, 10238629 + ... + 10238634.

It is an arithmetic number, because the mean of its divisors is an integer number (20477264).

Almost surely, 2^61431789 is an apocalyptic number.

It is an amenable number.

61431789 is a deficient number, since it is larger than the sum of its proper divisors (20477267).

61431789 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 11 representation: 61431789 = (31749681)₁₁.

61431789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20477266.

The product of its digits is 36288, while the sum is 39.

The square root of 61431789 is about 7837.8433896066. The cubic root of 61431789 is about 394.5763529263.

The spelling of 61431789 in words is "sixty-one million, four hundred thirty-one thousand, seven hundred eighty-nine".