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61357321 is a prime number
BaseRepresentation
bin1110101000001…
…1110100001001
311021110021102101
43222003310021
5111201413241
610031033401
71343346214
oct352036411
9137407371
1061357321
11316a8733
121866b861
13c933a0c
14821277b
1555bee31
hex3a83d09

61357321 has 2 divisors, whose sum is σ = 61357322. Its totient is φ = 61357320.

The previous prime is 61357319. The next prime is 61357337. The reversal of 61357321 is 12375316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54597321 + 6760000 = 7389^2 + 2600^2 .

It is a cyclic number.

It is not a de Polignac number, because 61357321 - 21 = 61357319 is a prime.

Together with 61357319, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 61357321.

It is not a weakly prime, because it can be changed into another prime (61357421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30678660 + 30678661.

It is an arithmetic number, because the mean of its divisors is an integer number (30678661).

Almost surely, 261357321 is an apocalyptic number.

It is an amenable number.

61357321 is a deficient number, since it is larger than the sum of its proper divisors (1).

61357321 is an equidigital number, since it uses as much as digits as its factorization.

61357321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 28.

The square root of 61357321 is about 7833.0914076117. The cubic root of 61357321 is about 394.4168524830.

It can be divided in two parts, 6135 and 7321, that added together give a square (13456 = 1162).

The spelling of 61357321 in words is "sixty-one million, three hundred fifty-seven thousand, three hundred twenty-one".