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BaseRepresentation
bin1111001000011011
310011000112
433020123
53440404
61154535
7345461
oct171033
9104015
1061979
1142625
122ba4b
1322298
1418831
151356e
hexf21b

61979 has 2 divisors, whose sum is σ = 61980. Its totient is φ = 61978.

The previous prime is 61967. The next prime is 61981. The reversal of 61979 is 97916.

Adding to 61979 its reverse (97916), we get a triangular number (159895 = T565).

Subtracting 61979 from its reverse (97916), we obtain a cube (35937 = 333).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61979 - 28 = 61723 is a prime.

Together with 61981, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (61909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30989 + 30990.

It is an arithmetic number, because the mean of its divisors is an integer number (30990).

261979 is an apocalyptic number.

61979 is a deficient number, since it is larger than the sum of its proper divisors (1).

61979 is an equidigital number, since it uses as much as digits as its factorization.

61979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402, while the sum is 32.

The square root of 61979 is about 248.9558193736. The cubic root of 61979 is about 39.5744470049.

The spelling of 61979 in words is "sixty-one thousand, nine hundred seventy-nine".